A: Yes. Flashing the NV file is permanent. It survives factory resets and firmware updates (unless the update specifically overwrites the MD1_DB partition).
The unlock file is a patched (Modem Database) file that bypasses the carrier check. When you flash this file using SP Flash Tool, you overwrite the lock flag, turning your carrier-locked device into a universal 4G modem/router. zte m028t l02c-1-30 unlock file
A: No. This only removes the carrier lock. LTE bands remain fully functional. A: Yes
: Some guides suggest disconnecting the device briefly during the "erase flash" stage (at roughly 3-10%) to force the acceptance of new loaders, though this varies by specific guide. you overwrite the lock flag