For many RDA-based feature phones, you can access the engineering or IMEI write menu directly from the keypad.
The fastest, most accessible way to restore a corrupted IMEI on a Coolsand/RDA feature phone is through the built-in keypad master codes. These codes open hidden service menus or execute direct commands. coolsand rda imei repair code best
: The hardware write was successful, but the phone's system cache hasn't updated. Try a master factory reset using the code *#1234# or *#0000# through the keypad after saving your values. For many RDA-based feature phones, you can access
Before touching any software: