Specialized software designed specifically for this chipset family. Flash Tool (e.g., UpgradeDownload):
The Coolsand RDA IMEI Repair Tool is a specialized Windows utility designed for devices powered by the RDA Microelectronics chipset. It is primarily used to restore or "write" a valid International Mobile Equipment Identity (IMEI) number if it becomes lost or corrupted due to software errors or firmware flashing.
tab that allows users to read info, unlock, and perform IMEI repairs. Infinity Box (Chinese Miracle-2 RDA/CoolSand module) coolsand rda imei repair tool
Enter the into the input field labeled IMEI 1 . If the device is a dual-SIM phone, enter the second original number into IMEI 2 .
An International Mobile Equipment Identity (IMEI) is a unique 15-digit number identifying a device on a cellular network. On Coolsand/RDA devices, this data is stored in the device's Non-Volatile RAM (NVRAM) or flash memory. Corruption typically occurs due to: Failed firmware updates or interrupted flashing processes. Using mismatched or corrupt firmware bin files. Hardware degradation of the flash memory chip. tab that allows users to read info, unlock,
: A highly specialized module designed specifically for these chips, offering stable flashing and IMEI maintenance capabilities. Volcano Box
They utilize virtual COM ports to establish stable communication with low-level bootloaders. An International Mobile Equipment Identity (IMEI) is a
Ensure you use a high-quality micro-USB cable capable of steady data transfer, not just charging.
Fix: Some chipsets have write-protected NVRAM blocks. You may need to flash a completely clean firmware file (Scatter/ROM) before running the IMEI repair tool, or check a "Force Write" checkbox in your utility.
RDA Microelectronics (which later merged with Spreadtrum to become Unisoc) manufactured highly integrated, low-cost system-on-chips (SoCs). They are widely used in:
Fully charged to at least 50% to prevent bricking during the write cycle. 2. Software & Drivers