Move the gateway near a window with a strong 5G signal. If the signal is too weak, the OTA update might fail to download.
Unplug the gateway for 30 seconds and plug it back in to force a fresh connection. nokia 5g21 gateway firmware download free
Are you experiencing a like dropping signals or slow speeds that makes you want to update? Nokia 5G21 Gateway | T-Mobile 5G Home Internet Move the gateway near a window with a strong 5G signal