How to Flash CUN-L21 with SD Card?
- Create new folder and rename it to dload.
- Now copy update.app file to dload folder that you downloaded in step 1.
- Now copy that dload folder to root of your sdcard.
- Put sdcard to you phone and power off your cell phone.
- Now press Volume + Volume – and power at the same time.
- Update process will start.
- Now wait for few minutes after update process finish cell phone will restart.
- Feel free to comment if you faced any error.