This is the safest method for offline flashing using a MicroSD card (at least 8GB). the SD card to FAT32 .
You can find the official flash files and drivers at the following reputable sites: Provides direct downloads for C431 stock ROMs (Android 9 and 10). This is the safest method for offline flashing
Wait for the process to complete; the device will reboot automatically once finished. This is the safest method for offline flashing
Press and hold simultaneously until the "Software Upgrade" screen appears. This is the safest method for offline flashing
Create a folder named in the root directory of the SD card.