Using the wrong firmware version or failing to use the "Clean All" option in flash tools can lead to partition mismatches.
After flashing a generic or another device's NVRAM file to fix the "Invalid IMEI" issue: REDMI 13C POCO C65-GALE-NVDATA NVRAM FILE FREE
| Tool / File | Purpose | | :--- | :--- | | | To flash the partitions without overwriting your whole OS. | | MTK USB VCOM Drivers | So your PC recognizes the phone in preloader mode. | | Liberty (or MTK Meta Utility) | Optional, for restoring IMEI via NVRAM. | | Scatter File (from your current ROM) | To tell SP Flash Tool where the NVRAM/NVDATA goes. | | Your phone’s original IMEI numbers | Found on your retail box or under the battery sticker. | | Windows 10/11 PC | Mac/Linux users will need a virtual machine. | Using the wrong firmware version or failing to