: Navigate to the RDA/Coolsand tab inside the software. Check the box marked "Write IMEI" . Select the correct boot type (often auto-detect or Coolsand_flsh_spi32m ). Enter the valid credentials, click "Start", and connect the powered-off phone while holding the boot key. Troubleshooting Common Coolsand Repair Errors
Connect the switched-off phone while holding its boot key to let the tool rewrite the corrupted NVRAM blocks. 3. Volcano Box / Piranha Box Tools
For specific RDA chipsets like the RDA8859, users have reported success using standalone "Write IMEI" tools found on file-sharing sites. However, these are less reliable and may not work for all devices. A more guaranteed method is to use a hardware box or dongle with chipset support. coolsand rda imei repair code best
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If you handle complex Coolsand RDA repairs (e.g., after a full flash erase or hardware reballing), the best solution is a commercial dongle. The top choices are: : Navigate to the RDA/Coolsand tab inside the software
Change the CPU type setting inside your software interface from Auto-detect to manual (e.g., 809C8002 ).
Before proceeding, you must understand the legal boundaries of IMEI modification: Enter the valid credentials, click "Start", and connect
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.
Connect the powered-off phone while holding the boot key (usually the central menu key or volume buttons). 3. Infinity CM2 (Chinese Miracle 2) RDA Module
Select SIM 1 , type in the exact 15-digit code matching your phone’s physical sticker, and hit save. Repeat for SIM 2 if applicable. Restart your phone and dial *#06# to verify the fix. Method 2: The Best Free Software Tools (PC Required)
If dial codes are disabled within your device’s specific firmware, you must utilize a computer and a USB data cable to write the IMEI directly to the chipset’s non-volatile memory. 1. Volcano Box / Inferno Tool