Vivo Y91 (1820) IMEI Fix Guide – Fix Null IMEI & Baseband Issues
If your Vivo Y91 (model 1820) is showing "null IMEI" or "unknown baseband" errors, flashing the correct firmware can resolve these issues. This official NV Data CM2 stock file is specifically designed to repair software corruption without risking further damage. Always backup your data before proceeding.
To use this file, you'll need SPD Flash Tool or QFIL, a compatible USB driver, and a charged device (minimum 50% battery). Avoid interrupting the process to prevent bricking.
Download Vivo Y91 (1820) Flash FilePost-flashing steps: After successful flashing, calibrate the IMEI using SN Writer Tool if needed. Test network signals and WiFi to confirm full functionality. For persistent issues, consult a Vivo service center.
This firmware is 100% tested and safe for unbricking or repairing the Vivo Y91. Avoid third-party modified files to prevent security risks. Bookmark this page for future reference.