I have updated my firmware come from Swisscom (Switzerland) to the factory one this weekend because I needed to use mPro Mesh solutions from Zyxel.
Base firmware branded : V5.13(ABQO.0)D0.
Updated firmware : V5.17(ABMT.6)C0
Download here :
https://www.zyxel.com/euosearch...Please watch this video to help you :
https://youtu.be/vHDUjFk9u1...STEP 1 : Use Terminal (MacOs) or PuTTY (Windows)
ssh (ip router) -l (username)
My exemple with Terminal : ssh 192.168.1.1 -l admin
STEP 2 : Follow these commands when connected
zycli
zycli modelcheck
zycli modelcheck show (Result : "ret:0")
zycli modelcheck off
zycli modelcheck show (Result : "ret:-17")
zycli fwidcheck show (Result : "ret:0")
zycli fwidcheck off
zycli fwidcheck show (Result : "ret:-17")
exit
STEP 3 : Update your firmware with the web interface
Enjoy