Knowing these details will allow me to provide tailored links or direct instructions for your hardware. Share public link

An IMEI can become corrupted, show as "Null," or read "0000000000000000" due to several common triggers:

This happens if you try to use an RDA script on a Coolsand chip or vice versa. Use a tool like Miracle Box to "Read Info" first to identify the exact chip inside the phone.

) to be held while connecting the USB cable to a powered-off device. Writing Process Open your chosen tool (e.g., Miracle Box Select the correct Boot/Chipset (e.g., RDA8851 or similar). original IMEI found on the device's sticker or box.

Locate the 15-digit number on the phone's physical housing. Step-by-Step Guide: Restoring IMEI on Coolsand/RDA Devices

| Tool | Type | Main Features | Price / License | | :--- | :--- | :--- | :--- | | | Hardware Dongle (Professional) | Multi-chipset (MTK, SPD, RDA/Coolsand) support, high-speed flashing, full-service operations (format, backup, lock removal) | Paid, with annual activation fees | | Miracle Box | Software / Dongle (Professional) | RDA/Coolsand support, full-service operations | Paid, but older versions available for free | | ProductLineTool | Software (OEM, Free) | Official tool for Coolsand RDA (互芯平台). It can write IMEI, SN, and flash firmware on modules | Free (may require older hardware & drivers) | | RDA_IMEI_Tool_v1.0.0.6 | Freeware (Legacy) | Lightweight tool dedicated to IMEI writing (includes iewimei_eng.exe ) | Free; may be unstable on modern systems | | RUDRA | Open Source (Experimental) | Firmware flashing/dumping for RDA feature phones. IMEI repair is possible by writing raw data | Free (requires technical skills and building from source) |

Before using any IMEI repair utility, it is critical to understand the legal boundaries:

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