just now try to upgrade to the new firmware manually, only get firmware upgrade once by unifi via TR-069 before, and it stuck but not hang at 34% forever, the internet and 192.168.0.1 router GUI is still working without any problem, but cannot login to 192.168.0.1 router GUI with the correct username and password, click Login and no respond multiple times, the router just manually restarted yesterday, try some method like unplug the fibre modem ethernet cable to the router and replug again, the internet doesnt work after that, after wait for around a hour more, turn off the router and turn it on again, the router has the new firmware, tried to upgrade the same new firmware again just in case.

Archer C1200(EU) V1 TM Unifi Wireless Router (Latest 23-8-2021)

Published Date: 2021-08-23

C1200v1_eu_tm-up-1.0.0 Build 20200306 rel.15999_2020-03-06_15.16.53.bin

unifi TR-069 upgrade firmware : C1200 v1.0 firmware 1.0.0 Build 20190805 rel.22215 (EU) , original firmware : C1200 v1.0 firmware 1.0.0 Build 20180403 rel.22124 (EU)