Wait for the transfer to complete. The router will flash its LEDs and reboot. This can take 10 minutes.
The only safe sources for an official are: zlt p21 firmware update
: If you experience random reboots, dropped connections, or UI glitches, a firmware update is often the primary solution. Wait for the transfer to complete
The internet is full of “custom” or “unlocked” files that promise to remove ISP limitations, enable external antenna gain controls, or unlock hidden LTE bands. While some are legitimate (e.g., from the 4PDA community), the risks outweigh the benefits for most users: or UI glitches