Zlt P21 Firmware Update Instant

: Always use a LAN/Ethernet cable to connect your computer to the router. Updating over Wi-Fi is risky and can lead to a "bricked" (unusable) device if the signal drops.

You usually need to open the case, short two test points on the PCB (J1 or J2), and force a serial bootloader recovery. This is not for casual users. zlt p21 firmware update

Wait for the transfer to complete. The router will flash its LEDs and reboot. This can take 10 minutes. : Always use a LAN/Ethernet cable to connect