diff --git a/project/ble_peripheral/ble_app_bladder_patch/hex/cpd.bat b/project/ble_peripheral/ble_app_bladder_patch/hex/cpd.bat
index e4cebce..37b77a6 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/hex/cpd.bat
+++ b/project/ble_peripheral/ble_app_bladder_patch/hex/cpd.bat
@@ -132,8 +132,8 @@ echo Flashing: program → reset (NO erase, FDS preserved)
 REM recover - SKIP to preserve internal flash data
 REM erase   - SKIP to preserve FDS/fstorage data
 
-REM program (sector-erase only for hex regions, FDS pages untouched)
-nrfutil device program --firmware hex\firmware_all.hex --serial-number %SERIALNUMBER%
+REM program (hex 데이터가 있는 영역만 erase, FDS 보존)
+nrfutil device program --firmware hex\firmware_all.hex --options chip_erase_mode=ERASE_RANGES_TOUCHED_BY_FIRMWARE --serial-number %SERIALNUMBER%
 if %errorlevel% neq 0 (
     echo.
     echo [WARNING] Program failed - device may have Readback Protection enabled.
@@ -145,7 +145,7 @@ if %errorlevel% neq 0 (
         nrfutil device recover --serial-number %SERIALNUMBER%
         if %errorlevel% neq 0 goto flash_fail
         echo Re-programming...
-        nrfutil device program --firmware hex\firmware_all.hex --serial-number %SERIALNUMBER%
+        nrfutil device program --firmware hex\firmware_all.hex --options chip_erase_mode=ERASE_RANGES_TOUCHED_BY_FIRMWARE --serial-number %SERIALNUMBER%
         if %errorlevel% neq 0 goto flash_fail
     ) else (
         goto flash_fail