*#197328640# (Samsung service menu – does not work on RDA)*#*#3646633#*#* (MTK engineer mode – NOT for RDA)*#*#22558463#*#* (Fake repair code)| Problem | Solution | |---------|----------| | Lost IMEI after flashing | Contact authorized service center | | Phone blocked/stolen | Cannot be legally fixed — return to owner or authorities | | Null/bad IMEI | Reflash original stock firmware from manufacturer |
It is free, uses no external hardware dongles, and works permanently if the filesystem is intact. The "best code" here is the AT+EGMR command. coolsand rda imei repair code best
For many feature phones using RDA CPUs, you can access the IMEI repair menu directly by dialing specific secret codes on the keypad: Primary Code: Alternative Codes: (to view), *#*#3646633#*#* General Process: After dialing the correct code, navigate to the Connectivity menu, then find settings to manually enter the original numbers. Top Professional Repair Tools Coolsand RDA IMEI Repair Code Best: A Comprehensive Guide
If the GUI buttons fail, use the inside CoolSand RDA: *#197328640# (Samsung service menu – does not work
The is a widely used chipset in budget-friendly feature phones and some older smartphone models. If you find your device displaying an "Invalid IMEI" error after a firmware flash or a factory reset, you likely need the specific service codes to restore its identity.
Connect the phone in "Boot Mode" (usually by holding the 'OK' or 'Call' button while plugging in the USB). 2. Miracle Box / Thunder Edition