The is a powerful utility, but with great power comes great responsibility.
Older IMEI repair tools often fail to recognize newer RDA processor variants. The is updated to: Bypass updated security checks in the latest RDA firmware.
Ensure the phone battery is charged to at least 50%. Try a different physical USB port (ideally a motherboard port on the back of the PC rather than a front-panel hub) and experiment with alternative boot keys. "Write Error / Protected NVRAM"
: Type the correct 15-digit IMEI number found on the device’s battery compartment or original packaging. coolsand rda imei repair tool new
Open Windows Device Manager. Look for an item with a yellow exclamation mark under "Ports (COM & LPT)" or "Universal Serial Bus controllers". Right-click it, choose "Update Driver," and manually point the system to your extracted Coolsand driver folder. "Write Timeout" or "Boot Failed"
Ability to back up existing NVRAM data before repairing. Why Do You Need This Tool? IMEI issues on Coolsand devices usually occur due to:
Mobile technicians frequently encounter budget feature phones and legacy smartphones with corrupted or invalid International Mobile Equipment Identity (IMEI) numbers. This issue typically happens after a bad firmware flash, a hard reset, or software corruption. The is a powerful utility, but with great
For the more tech-savvy individual, a simpler tool exists. The (e.g., version 1.0.0.6) is a lightweight executable (often named iewimei_eng.exe ) created by RDA Microelectronics.
What (e.g., RDA8851) are you working on? Which Windows operating system version is your PC running?
: Choose the Coolsand/RDA tab from the device list. Ensure the phone battery is charged to at least 50%
The is a specialized utility designed to restore or write IMEI numbers on mobile devices powered by Coolsand and RDA chipsets , which are common in budget-friendly feature phones. This tool is essential for fixing "Invalid IMEI," "Unknown IMEI," or network signal issues often caused by software corruption or improper flashing. Key Features of the New Version
For Linux users and developers, a powerful new open-source tool emerged in late 2024 and received a major update in mid-2025: . Created by developers on GitHub, this command-line tool provides flashing and dumping capabilities for RDA feature phones and CPUs, representing a more modern, open alternative to proprietary solutions.
The Coolsand RDA IMEI Repair Tool is a dedicated utility software designed specifically to flash or rewrite the 15-digit IMEI number on phones powered by .
Click the , Write , or Repair button inside the software interface. The tool will transition into a "Waiting for Device" state.