diff --git a/docs/guide/libbbfdm_DeviceInfo_FirmwareImage.md b/docs/guide/libbbfdm_DeviceInfo_FirmwareImage.md
index 3d101bf01a5a7cad20adee799abdf83d48183045..4151da9b061c9fcf92b766b4c30a59cb8245e983 100644
--- a/docs/guide/libbbfdm_DeviceInfo_FirmwareImage.md
+++ b/docs/guide/libbbfdm_DeviceInfo_FirmwareImage.md
@@ -133,9 +133,9 @@ Device.DeviceInfo.FirmwareImage.{i}.Download() input:FileSize
 Device.DeviceInfo.FirmwareImage.{i}.Download() input:Password
 Device.DeviceInfo.FirmwareImage.{i}.Download() input:URL
 Device.DeviceInfo.FirmwareImage.{i}.Download() input:Username
-Device.DeviceInfo.FirmwareImage.{i}.Download() input:X_IOPSYS_EU_KeepConfig
+Device.DeviceInfo.FirmwareImage.{i}.Download() input:X_IOWRT_EU_KeepConfig
 ```
 
-Customer can use X_IOPSYS_EU_KeepConfig=0, to do factory reset(not copy the current config to next firmware) while doing the download.
+Customer can use X_IOWRT_EU_KeepConfig=0, to do factory reset(not copy the current config to next firmware) while doing the download.
 
-> Note: Default value of X_IOPSYS_EU_KeepConfig is 1, so in case this option not used, it keeps the config(as the default behavior of the CPE).
+> Note: Default value of X_IOWRT_EU_KeepConfig is 1, so in case this option not used, it keeps the config(as the default behavior of the CPE).
diff --git a/src/Makefile b/src/Makefile
index adb7c0b3df21f91cf1cbe2599a0d5d5b35079c25..7d7571b818bc60dea9327dec30cbbc4583cc4862 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -40,7 +40,7 @@ endif
 ifeq ($(SYSMNGR_VENDOR_EXTENSIONS),y)
 PROG_CFLAGS += -DSYSMNGR_VENDOR_EXTENSIONS
 ifeq ($(filter -DCUSTOM_PREFIX=%,$(PROG_CFLAGS)),)
-PROG_CFLAGS += -DCUSTOM_PREFIX=\"X_IOPSYS_EU_\"
+PROG_CFLAGS += -DCUSTOM_PREFIX=\"X_IOWRT_EU_\"
 endif
 endif