diff --git a/bundle.json b/bundle.json
index 68550561898528ea6cdce996e53df83b534c4595..b6cf4ecef4cd642a2e7815af2cb8791f7077b84f 100644
--- a/bundle.json
+++ b/bundle.json
@@ -50,7 +50,7 @@
                 "init",
                 "hdc",
                 "drivers_interface_input",
-                "drivers_interface_partitionslot",
+                "drivers_peripheral_partitionslot",
                 "c_utils",
                 "hilog",
                 "selinux_adapter",
diff --git a/interfaces/kits/slot_info/BUILD.gn b/interfaces/kits/slot_info/BUILD.gn
index 98db2059161ca9414e15416c8ad7c98e60b2def6..3aff7f72cd498f275a04b8e0b00a800329d9bbb4 100644
--- a/interfaces/kits/slot_info/BUILD.gn
+++ b/interfaces/kits/slot_info/BUILD.gn
@@ -29,7 +29,7 @@ ohos_static_library("libslotinfo") {
     defines = [ "UPDATER_AB_SUPPORT" ]
     external_deps = [
       "c_utils:utils",
-      "drivers_interface_partitionslot:libpartitionslot_proxy_1.0",
+      "drivers_peripheral_partitionslot:libpartition_slot_manager",
       "hilog:libhilog_base",
       "init:libbegetutil_static",
     ]
diff --git a/interfaces/kits/slot_info/slot_info.cpp b/interfaces/kits/slot_info/slot_info.cpp
index 0948b5f59e0d5b65534fa8ddb67921120979ab19..e6f2787dcd01ac11f55d9d30b7cadbf5ab21eb1f 100644
--- a/interfaces/kits/slot_info/slot_info.cpp
+++ b/interfaces/kits/slot_info/slot_info.cpp
@@ -17,8 +17,7 @@
 
 #include "log/log.h"
 #ifdef UPDATER_AB_SUPPORT
-#include "v1_0/ipartition_slot.h"
-using namespace OHOS::HDI::Partitionslot::V1_0;
+#include "partitionslot_manager.h"
 #endif
 
 namespace Updater {
@@ -37,15 +36,10 @@ void SetActiveSlot()
 #else
 void GetPartitionSuffix(std::string &suffix)
 {
-    sptr<OHOS::HDI::Partitionslot::V1_0::IPartitionSlot> partitionslot =
-        OHOS::HDI::Partitionslot::V1_0::IPartitionSlot::Get(true);
-    if (partitionslot == nullptr) {
-        LOG(ERROR) << "partitionslot ptr is nullptr";
-        return;
-    }
+    OHOS::HDI::Partitionslot::V1_0::PartitionSlotManager psMgr;
     int32_t curSlot = -1;
     int32_t numOfSlots = 0;
-    int32_t ret = partitionslot->GetCurrentSlot(curSlot, numOfSlots);
+    int32_t ret = psMgr.GetCurrentSlot(curSlot, numOfSlots);
     LOG(INFO) << "Get slot info, curSlot: " << curSlot << "numOfSlots :" << numOfSlots;
     if (ret != 0 || curSlot <= 0 || curSlot > 2 || numOfSlots != 2) { // 2: max slot num
         suffix = "";
@@ -53,7 +47,7 @@ void GetPartitionSuffix(std::string &suffix)
     }
 
     int32_t updateSlot = curSlot == 1 ? 2 : 1;
-    ret = partitionslot->GetSlotSuffix(updateSlot, suffix);
+    ret = psMgr.GetSlotSuffix(updateSlot, suffix);
     if (ret != 0) {
         LOG(ERROR) << "Get slot suffix error, partitionPath: " << suffix;
         suffix = "";
@@ -62,22 +56,17 @@ void GetPartitionSuffix(std::string &suffix)
 
 void GetActivePartitionSuffix(std::string &suffix)
 {
-    sptr<OHOS::HDI::Partitionslot::V1_0::IPartitionSlot> partitionslot =
-        OHOS::HDI::Partitionslot::V1_0::IPartitionSlot::Get(true);
-    if (partitionslot == nullptr) {
-        LOG(ERROR) << "partitionslot ptr is nullptr";
-        return;
-    }
+    OHOS::HDI::Partitionslot::V1_0::PartitionSlotManager psMgr;
     int32_t curSlot = -1;
     int32_t numOfSlots = 0;
-    int32_t ret = partitionslot->GetCurrentSlot(curSlot, numOfSlots);
+    int32_t ret = psMgr.GetCurrentSlot(curSlot, numOfSlots);
     LOG(INFO) << "Get slot info, curSlot: " << curSlot << "numOfSlots :" << numOfSlots;
     if (ret != 0 || curSlot <= 0 || curSlot > 2 || numOfSlots != 2) { // 2: max slot num
         suffix = "";
         return;
     }
 
-    ret = partitionslot->GetSlotSuffix(curSlot, suffix);
+    ret = psMgr.GetSlotSuffix(curSlot, suffix);
     if (ret != 0) {
         LOG(ERROR) << "Get slot suffix error, partitionPath: " << suffix;
         suffix = "";
@@ -86,22 +75,17 @@ void GetActivePartitionSuffix(std::string &suffix)
 
 void SetActiveSlot()
 {
-    sptr<OHOS::HDI::Partitionslot::V1_0::IPartitionSlot> partitionslot =
-        OHOS::HDI::Partitionslot::V1_0::IPartitionSlot::Get(true);
-    if (partitionslot == nullptr) {
-        LOG(ERROR) << "partitionslot ptr is nullptr";
-        return;
-    }
+    OHOS::HDI::Partitionslot::V1_0::PartitionSlotManager psMgr;
     int32_t curSlot = -1;
     int32_t numOfSlots = 0;
-    int32_t ret = partitionslot->GetCurrentSlot(curSlot, numOfSlots);
+    int32_t ret = psMgr.GetCurrentSlot(curSlot, numOfSlots);
     LOG(INFO) << "Get slot info, curSlot: " << curSlot << "numOfSlots :" << numOfSlots;
     if (ret != 0 || curSlot <= 0 || curSlot > 2 || numOfSlots != 2) { // 2: max slot num
         return;
     }
 
     int32_t activeSlot = curSlot == 1 ? 2 : 1;
-    ret = partitionslot->SetActiveSlot(activeSlot);
+    ret = psMgr.SetActiveSlot(activeSlot);
     if (ret != 0) {
         LOG(ERROR) << "Set active slot error, slot: " << activeSlot;
     }
diff --git a/services/BUILD.gn b/services/BUILD.gn
index f1c260f5391422ab84ef6d0e5fb9c02234288ef6..694a757cdfd4a61c8b819583d3fa3a09d4baf416 100755
--- a/services/BUILD.gn
+++ b/services/BUILD.gn
@@ -99,6 +99,7 @@ ohos_static_library("libupdater_static") {
     "openssl:libcrypto_shared",
     "openssl:libssl_shared",
     "zlib:libz",
+    "drivers_peripheral_partitionslot:libpartition_slot_manager",
   ]
   if (updater_ui_support) {
     external_deps += [ "drivers_interface_input:libinput_proxy_1.0" ]
@@ -177,6 +178,7 @@ ohos_static_library("libupdater") {
     "openssl:libcrypto_shared",
     "openssl:libssl_shared",
     "zlib:libz",
+    "drivers_peripheral_partitionslot:libpartition_slot_manager",
   ]
 
   # add updater custom library
diff --git a/services/applypatch/command_process.cpp b/services/applypatch/command_process.cpp
index dba56dfb263ef573976010eee12ba0d2e159394a..2ebf2af4a8c6a08f265c75407415ec7a8166a5f9 100644
--- a/services/applypatch/command_process.cpp
+++ b/services/applypatch/command_process.cpp
@@ -247,7 +247,7 @@ CommandResult DiffAndMoveCommandFn::Execute(const Command &params)
             offset = Utils::String2Int<size_t>(params.GetArgumentByPos(pos++), Utils::N_DEC);
         }
         size_t patchLength = Utils::String2Int<size_t>(params.GetArgumentByPos(pos++), Utils::N_DEC);
-        if (params.GetTransferParams()->isUpdaterMode) {
+        if (Utils::IsUpdaterMode()) {
             uint8_t *patchBuffer = params.GetTransferParams()->dataBuffer + offset;
             ret = WriteDiffToBlock(params, buffer, patchBuffer, patchLength, targetBlock);
         } else {
diff --git a/services/flow_update/update_bin/component_processor.cpp b/services/flow_update/update_bin/component_processor.cpp
index f2cfccc1e23acf10b895b821511ca44879814699..2794d04edf11747793de2df121200696ca916d2a 100644
--- a/services/flow_update/update_bin/component_processor.cpp
+++ b/services/flow_update/update_bin/component_processor.cpp
@@ -259,8 +259,7 @@ int RawImgProcessor::GetWritePathAndOffset(const std::string &partitionName, std
 
 #ifndef UPDATER_UT
     if (partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         writePath += suffix;
     }
     LOG(INFO) << "write partition path: " << writePath;
diff --git a/services/include/updater/updater.h b/services/include/updater/updater.h
index bcdf5f3776c76b7bdb603af1f836e83665f77507..ab6f212c75ab011c3ef1571893890d7aeedc0dd1 100644
--- a/services/include/updater/updater.h
+++ b/services/include/updater/updater.h
@@ -97,8 +97,12 @@ void ProgressSmoothHandler(int beginProgress, int endProgress,
 
 UpdaterStatus SetUpdateSlotParam(UpdaterParams &upParams, bool isUpdateCurrSlot);
 
+UpdaterStatus SetUpdateSuffixParam();
+
 UpdaterStatus ClearUpdateSlotParam();
 
+UpdaterStatus ClearUpdateSuffixParam();
+
 UpdaterStatus DoInstallUpdaterPackage(Hpackage::PkgManager::PkgManagerPtr pkgManager,
     UpdaterParams &upParams, PackageUpdateMode updateMode);
 
diff --git a/services/stream_update/bin_chunk_update.cpp b/services/stream_update/bin_chunk_update.cpp
index a9140fd93e0e05da3c3a37b68efc246c1f1e09d2..23a5faa259a969543c7a9801b426b4da00f6753f 100755
--- a/services/stream_update/bin_chunk_update.cpp
+++ b/services/stream_update/bin_chunk_update.cpp
@@ -214,15 +214,11 @@ UpdateResultCode BinChunkUpdate::UpdateBinHash(uint8_t *data, uint32_t &len)
         return STREAM_UPDATE_FAILURE;
     }
 
-    //切换ab分区
-    #ifndef UPDATER_UT
-    SetActiveSlot();
-    #else
     int result = remove("/data/updater/test.txt");
     if (result != 0) {
         LOG(ERROR) << "Failed to remove /data/updater/test.txt, error: " << strerror(errno);
     }
-    #endif
+
     LOG(DEBUG) << "BinChunkUpdate::UpdateBinHash exit";
     return STREAM_UPDATE_COMPLETE;
 }
@@ -518,10 +514,9 @@ bool BinChunkUpdate::OpenDevPath()
     targetPath = devPath;
 
     if (updateInfo_.curPartition != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         targetPath += suffix;
-        GetActivePartitionSuffix(suffix);
+        suffix = Utils::GetUpdateActiveSuffix();
         srcPath += suffix;
     }
 
@@ -761,8 +756,7 @@ std::string BinChunkUpdate::ComputeFileHash(const std::string &partitionName,
     #ifndef UPDATER_UT
     std::string devPath = GetBlockDeviceByMountPoint(partitionName);
     if (partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         devPath += suffix;
     }
     #else
diff --git a/services/updater.cpp b/services/updater.cpp
index f0fba5394728cd52468f34bf156e7a73bd1283cf..48500398c4d0cb343c906ea4427f015bcc21bc1e 100644
--- a/services/updater.cpp
+++ b/services/updater.cpp
@@ -52,6 +52,7 @@
 #include "updater_ui_stub.h"
 #include "utils.h"
 #include "write_state/write_state.h"
+#include "slot_info/slot_info.h"
 
 namespace Updater {
 using Updater::Utils::SplitString;
@@ -323,7 +324,18 @@ UpdaterStatus SetUpdateSlotParam(UpdaterParams &upParams, bool isUpdateCurrSlot)
     }
     return UPDATE_SUCCESS;
 }
- 
+
+UpdaterStatus SetUpdateSuffixParam()
+{
+    std::string updateSuffix = "";
+    GetPartitionSuffix(updateSuffix);
+    if (!Utils::SetUpdateSuffix(updateSuffix)) {
+        LOG(ERROR) << "set update.part.suffix fail";
+        return UPDATE_ERROR;
+    }
+    return UPDATE_SUCCESS;
+}
+
 UpdaterStatus ClearUpdateSlotParam()
 {
     if (!Utils::IsVabDevice()) {
@@ -337,6 +349,16 @@ UpdaterStatus ClearUpdateSlotParam()
     return UPDATE_SUCCESS;
 }
 
+UpdaterStatus ClearUpdateSuffixParam()
+{
+    std::string updateSuffix = " ";
+    if (!Utils::SetUpdateSuffix(updateSuffix)) {
+        LOG(ERROR) << "clear update.part.suffix fail";
+        return UPDATE_ERROR;
+    }
+    return UPDATE_SUCCESS;
+}
+
 UpdaterStatus DoInstallUpdaterBinfile(PkgManager::PkgManagerPtr pkgManager, UpdaterParams &upParams,
     PackageUpdateMode updateMode)
 {
diff --git a/services/updater_binary/BUILD.gn b/services/updater_binary/BUILD.gn
index e196cd239de036fca9d1ea4efc93d35232cfdfd5..afbb7c39d87c31fe2523e297dd7dce28fc190cac 100644
--- a/services/updater_binary/BUILD.gn
+++ b/services/updater_binary/BUILD.gn
@@ -58,7 +58,6 @@ ohos_static_library("libupdater_binary") {
 
   deps = [
     "${updater_path}/interfaces/kits/misc_info:libmiscinfo",
-    "${updater_path}/interfaces/kits/slot_info:libslotinfo",
     "${updater_path}/services/applypatch:libapplypatch",
     "${updater_path}/services/diffpatch/patch:libpatch",
     "${updater_path}/services/flow_update/update_bin:libBinFlowUpdate",
diff --git a/services/updater_binary/update_image_block.cpp b/services/updater_binary/update_image_block.cpp
index 95a6048fcd6fb514d8a814864602d64516987ab0..a37187bf24502677ddd7f589c4d303ef426fc44c 100644
--- a/services/updater_binary/update_image_block.cpp
+++ b/services/updater_binary/update_image_block.cpp
@@ -181,8 +181,7 @@ static int32_t GetUpdateBlockInfo(struct UpdateBlockInfo &infos, Uscript::UScrip
     infos.devPath = GetBlockDeviceByMountPoint(infos.partitionName);
 #ifndef UPDATER_UT
     if (infos.partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         infos.devPath += suffix;
     }
 #else
@@ -498,8 +497,7 @@ int32_t UScriptInstructionBlockCheck::Execute(Uscript::UScriptEnv &env, Uscript:
     auto devPath = GetBlockDeviceByMountPoint(partitionName);
 #ifndef UPDATER_UT
     if (partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         devPath += suffix;
     }
 #else
@@ -767,8 +765,7 @@ int32_t UScriptInstructionShaCheck::Execute(Uscript::UScriptEnv &env, Uscript::U
     }
 #ifndef UPDATER_UT
     if (partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         devPath += suffix;
     }
     LOG(INFO) << "write partition path: " << devPath;
diff --git a/services/updater_binary/update_image_patch.cpp b/services/updater_binary/update_image_patch.cpp
index ec3b3c58496b4fe11ad57b95805e37ed5dec2126..8e74f466011c34cc288be42f9bfb3211863b0af6 100644
--- a/services/updater_binary/update_image_patch.cpp
+++ b/services/updater_binary/update_image_patch.cpp
@@ -73,8 +73,7 @@ int32_t USInstrImagePatch::GetParam(Uscript::UScriptContext &context, ImagePatch
     para.devPath = GetBlockDeviceByMountPoint(para.partName);
 #ifndef UPDATER_UT
     if (para.partName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         para.devPath += suffix;
     }
 #else
@@ -264,8 +263,7 @@ int32_t USInstrImageShaCheck::GetParam(Uscript::UScriptContext &context, CheckPa
     para.devPath = GetBlockDeviceByMountPoint(para.partName);
 #ifndef UPDATER_UT
     if (para.partName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         para.devPath += suffix;
     }
 #else
diff --git a/services/updater_binary/update_processor.cpp b/services/updater_binary/update_processor.cpp
index 78a1732597899883131ba71743a6ac634c61fd43..e38ee4abdae4016e339b7b1245e9349328233879 100644
--- a/services/updater_binary/update_processor.cpp
+++ b/services/updater_binary/update_processor.cpp
@@ -460,8 +460,7 @@ int UScriptInstructionRawImageWrite::GetWritePathAndOffset(const std::string &pa
 
 #ifndef UPDATER_UT
     if (partitionName != "/userdata") {
-        std::string suffix = "";
-        GetPartitionSuffix(suffix);
+        std::string suffix = Utils::GetUpdateSuffix();
         writePath += suffix;
     }
     LOG(INFO) << "write partition path: " << writePath;
diff --git a/services/updater_main.cpp b/services/updater_main.cpp
index d30ad7279262c4aa7aee80bd84d14f8e6aa0295e..168ba17277886409ef31d0af97ef7c01009b35a5 100644
--- a/services/updater_main.cpp
+++ b/services/updater_main.cpp
@@ -662,6 +662,21 @@ static UpdaterStatus VerifyCommonFiles(UpdaterParams &upParams)
     return UPDATE_SUCCESS;
 }
 
+static UpdaterStatus SetUpdateParam(UpdaterParams &upParams, bool isUpdateCurrSlot)
+{
+    // set update slot
+    if (SetUpdateSlotParam(upParams, false) != UPDATE_SUCCESS) {
+        LOG(ERROR) << "SetUpdateSlotParam failed";
+        return UPDATE_ERROR;
+    }
+    // set update suffix
+    if (SetUpdateSuffixParam() != UPDATE_SUCCESS) {
+        LOG(ERROR) << "SetUpdateSuffixParam failed";
+        return UPDATE_ERROR;
+    }
+    return UPDATE_SUCCESS;
+}
+
 static UpdaterStatus PreUpdatePackages(UpdaterParams &upParams)
 {
     UPDATER_INIT_RECORD;
@@ -685,8 +700,8 @@ static UpdaterStatus PreUpdatePackages(UpdaterParams &upParams)
         (void)DeleteFile(resultPath);
         LOG(INFO) << "delete last upgrade file";
     }
-    if (SetUpdateSlotParam(upParams, false) != UPDATE_SUCCESS) {
-        LOG(ERROR) << "SetUpdateSlotParam failed";
+    if (SetUpdateParam(upParams, false) != UPDATE_SUCCESS) {
+        LOG(ERROR) << "SetUpdateParam failed";
         return UPDATE_ERROR;
     }
     // verify package first
@@ -918,6 +933,7 @@ static void PostUpdate(UpdaterParams &upParams, UpdaterStatus &status,
         status = CheckAndSetSlot(upParams);
     }
     ClearUpdateSlotParam();
+    ClearUpdateSuffixParam();
     ShowSuccessUi(upParams, status);
     bool updateResult = (status == UPDATE_SUCCESS);
 
@@ -976,8 +992,8 @@ static UpdaterStatus PreSdcardUpdatePackages(UpdaterParams &upParams)
         LOG(ERROR) << "Battery is not sufficient for install package.";
         return UPDATE_SKIP;
     }
-    if (SetUpdateSlotParam(upParams, true) != UPDATE_SUCCESS) {
-        LOG(ERROR) << "SetUpdateSlotParam failed";
+    if (SetUpdateParam(upParams, true) != UPDATE_SUCCESS) {
+        LOG(ERROR) << "SetUpdateParam failed";
         return UPDATE_ERROR;
     }
     UpdaterStatus status = VerifyPackages(upParams);
@@ -996,6 +1012,7 @@ static UpdaterStatus PreSdcardUpdatePackages(UpdaterParams &upParams)
 static void PostSdcardUpdatePackages(UpdaterParams &upParams, UpdaterStatus &status)
 {
     ClearUpdateSlotParam();
+    ClearUpdateSuffixParam();
     if (Utils::CheckUpdateMode(Updater::SDCARD_INTRAL_MODE)) {
         PostUpdatePackages(upParams, status);
     } else if (status == UPDATE_SUCCESS) {
diff --git a/test/unittest/service_test/BUILD.gn b/test/unittest/service_test/BUILD.gn
index cdbdf00f508db489ad1c1c07d45f1b87452e0ec8..d3588b1a5f18951ebf3475c9a3b9f142e55de99f 100644
--- a/test/unittest/service_test/BUILD.gn
+++ b/test/unittest/service_test/BUILD.gn
@@ -53,6 +53,7 @@ ohos_unittest("updater_service_unittest") {
 
   deps = [
     "${updater_path}/interfaces/kits/misc_info:libmiscinfo",
+    "${updater_path}/interfaces/kits/slot_info:libslotinfo",
     "${updater_path}/interfaces/kits/packages:libpackageExt",
     "${updater_path}/services/applypatch:libapplypatch",
     "${updater_path}/services/diffpatch/patch:libpatch",
diff --git a/updater_default_cfg.gni b/updater_default_cfg.gni
index 7c87383b5c82a527c3efac50245a48eddacbc39c..130b14a9e20ef570ca0943defc87b9f53e6b3d13 100644
--- a/updater_default_cfg.gni
+++ b/updater_default_cfg.gni
@@ -13,7 +13,7 @@
 
 import("//build/ohos.gni")
 
-init_feature_ab_partition = false
+init_feature_ab_partition = true
 declare_args() {
   updater_cfg_file = ""
   updater_ui_support = true
diff --git a/utils/include/utils.h b/utils/include/utils.h
index 7cefae4d3efbce8df5a2deb76b98bf8288f08cd1..c8f93d68d2ccc912d8161fd1817b81282efd9df2 100644
--- a/utils/include/utils.h
+++ b/utils/include/utils.h
@@ -117,7 +117,10 @@ bool ConvertToDouble(const std::string &str, double &value);
 bool ConvertToFloat(const std::string &str, float &value);
 bool IsVabDevice();
 bool SetUpdateSlot(int updateSlot);
+bool SetUpdateSuffix(std::string stringsuffix);
 int GetUpdateSlot();
+std::string GetUpdateSuffix();
+std::string GetUpdateActiveSuffix();
 #ifndef __WIN32
 void SetFileAttributes(const std::string& file, uid_t owner, gid_t group, mode_t mode);
 #endif
diff --git a/utils/utils.cpp b/utils/utils.cpp
index 4c81481c836aa1b33587c9db6fe6fb605ddd58fb..069c83edfb88fceda1b24ea4daaf5567279ca8a5 100644
--- a/utils/utils.cpp
+++ b/utils/utils.cpp
@@ -1111,7 +1111,30 @@ bool SetUpdateSlot(int setSlot)
     }
     return false;
 }
- 
+
+bool SetUpdateSuffix(std::string stringsuffix)
+{
+    if (stringsuffix.empty()) {
+        LOG(ERROR) << "suffix is empty";
+        return false;
+    }
+    int tryNum = 3;
+    while (tryNum-- > 0) {
+        if (SetParameter("update.part.suffix", stringsuffix.c_str()) != 0) {
+            LOG(ERROR) << "set update.part.suffix fail";
+            continue;
+        }
+        if (strcmp(GetUpdateSuffix().c_str(), stringsuffix.c_str()) == 0) {
+            LOG(INFO) << "set update.part.suffix is " << stringsuffix;
+            return true;
+        }
+        if (tryNum != 0) {
+            sleep(1);
+        }
+    }
+    return false;
+}
+
 int GetUpdateSlot()
 {
     if (!IsVabDevice()) {
@@ -1130,6 +1153,36 @@ int GetUpdateSlot()
     return updateSlot;
 }
 
+std::string GetUpdateSuffix()
+{
+    char paramValue[PARAM_SIZE + 1] = {0};
+    if (GetParameter("update.part.suffix", "", paramValue, sizeof(paramValue) - 1) <= 0) {
+        LOG(ERROR) << "get update.part.suffix failed";
+        return std::string(paramValue);
+    }
+    LOG(INFO) << "GetUpdateSuffix = " << paramValue;
+    return std::string(paramValue);
+}
+
+std::string GetUpdateActiveSuffix()
+{
+    char paramValue[PARAM_SIZE + 1] = {0};
+    if (GetParameter("update.part.suffix", "", paramValue, sizeof(paramValue) - 1) <= 0) {
+        LOG(ERROR) << "get update.part.suffix failed";
+        return std::string(paramValue);
+    }
+    if (strcmp(paramValue, "_a") == 0) {
+        strncpy_s(paramValue, sizeof(paramValue), "_b", sizeof("_b"));
+    } else if (strcmp(paramValue, "_b") == 0) {
+        strncpy_s(paramValue, sizeof(paramValue), "_a", sizeof("_a"));
+    } else {
+        LOG(ERROR) << "Unexpected suffix value: " << paramValue;
+        return std::string(paramValue);
+    }
+    LOG(INFO) << "GetUpdateActiveSuffix = " << paramValue;
+    return std::string(paramValue);
+}
+
 #ifndef __WIN32
 void SetFileAttributes(const std::string& file, uid_t owner, gid_t group, mode_t mode)
 {