diff --git a/device/config/chips/v851s/configs/fastboot_sl100_back/linux/sys_partition_nor.fex b/device/config/chips/v851s/configs/fastboot_sl100_back/linux/sys_partition_nor.fex
index 2f0eca06f..f5a27d98d 100755
--- a/device/config/chips/v851s/configs/fastboot_sl100_back/linux/sys_partition_nor.fex
+++ b/device/config/chips/v851s/configs/fastboot_sl100_back/linux/sys_partition_nor.fex
@@ -65,7 +65,7 @@ size = 16
 
 [partition]
     name         = recovery
-    size         = 5632
+    size         = 4864
     downloadfile = "recovery.fex"
     user_type    = 0x8000
 
diff --git a/target/allwinner/v851s-fastboot_sl100_back/defconfig_ota b/target/allwinner/v851s-fastboot_sl100_back/defconfig_ota
index f123cfb0f..4f0d7e3f7 100755
--- a/target/allwinner/v851s-fastboot_sl100_back/defconfig_ota
+++ b/target/allwinner/v851s-fastboot_sl100_back/defconfig_ota
@@ -1839,7 +1839,7 @@ CONFIG_BUSYBOX_CONFIG_CRONTAB=y
 # CONFIG_BUSYBOX_CONFIG_FEATURE_DEVFS is not set
 # CONFIG_BUSYBOX_CONFIG_DEVMEM is not set
 # CONFIG_BUSYBOX_CONFIG_FBSPLASH is not set
-# CONFIG_BUSYBOX_CONFIG_FLASH_ERASEALL is not set
+CONFIG_BUSYBOX_CONFIG_FLASH_ERASEALL=y
 # CONFIG_BUSYBOX_CONFIG_FLASH_LOCK is not set
 # CONFIG_BUSYBOX_CONFIG_FLASH_UNLOCK is not set
 # CONFIG_BUSYBOX_CONFIG_FLASHCP is not set