Nas542 Network problem

bulutnet

Hello. I bought Zyxel Nas542. latest software version after using for a while
V5.21(ABAG.9)
I upgraded. I can't get pppoe connection after upgrade. It does not accept the process of reverting to the old version. I'm waiting for your help.

Mijzelf

If you login over ssh (as root) and execute

echo 1 > /firmware/mnt/info/revision

you can downgrade by uploading a firmware file in the webinterface.