Repairing an invalid IMEI or null baseband on the Redmi 9 (Lancelot/Cattail) involves utilizing MTK-compatible tools like Chimera Tool, Pandora Box, or UnlockTool to interface with the device in BROM mode. The process generally requires repairing the second IMEI and applying a patch certificate to restore network functionality, particularly following NVData corruption. For detailed visual instructions, you can watch a YouTube video, such as the Xiaomi Redmi 9 repair imei - YouTube video .
Requires selecting the "Xiaomi V2" preloader authentication in the MediaTek tab. Can also be used for FRP (Factory Reset Protection) unlocking redmi 9 imei repair unlock tool
: Specialized in patching IMEI for newer security versions. It can often handle devices even with a locked bootloader using specialized "Patch BL" methods. Hydra Tool (Paid) : Known for its versatility, the Hydra Tool Repairing an invalid IMEI or null baseband on
Professional, paid software that offers one-click repair for various Xiaomi models, including MediaTek-based Redmi devices. Part 10: When to Pay for a Professional