A dumped NVRAM.bin (size usually 512KB or 5MB depending on firmware) follows this internal structure: mt6768 nvram file

MT6768 stock ROMs often include a default NVRAM0 (factory NVRAM). Restore via SP Flash Tool: A dumped NVRAM

: They look for a scatter file and an nvram.img or nvdata.img pulled from a healthy "donor" device of the exact same model. mt6768 nvram file

: Ensure your phone is completely powered off.

Do you already have a or an NVRAM backup for your phone? Share public link