Every MediaTek smartphone contains an NVRAM partition. This partition stores permanent, device-specific information that must persist even after a hard reset or a complete firmware flash.

Note: Always match the database version with your current Android build version to prevent bootloops. How to Flash MT6765 NVRAM Database Using Maui Meta

The device fails to register on any cellular network.

If you or a friend has the exact same phone model with a clean IMEI, you can back up its NVRAM using or SP Flash Tool (Read Back method) . This gives you a 100% compatible free file.