Zyxel EX3301-T0

rycket

Why can't I upgrade formware to the version found in the files EX3301-T0_5.50(ABVY.4)C0 ?

My current formware version is V5.50(ABVY.3.1)I0

rycket

Firmware it skould be :)

The message I receive is

Image uploading failed. You may press 'Cancel' to upload another firmware image file, or press 'OK' to reboot to recover normal operation.

Peter2

You have a special branded firmware from your ISP so it dont works , and if your contract is actual with this ISP you may have no right to upload this original firmware at least you should contact your ISP before . Maybe its owned by your ISP too ?

Otherwise you can try to upload the original firmware via ftp like this :

https://community.zyxel.com/en/discussion/15069/how-to-upgrade-firmware-to-the-controller-access-point-by-ftp

https://support.zyxel.eu/hc/en-us/articles/360005562413-Download-Upload-Configuration-File-via-FTP-on-a-USG