How to upgrade firmware of vmg 3312-T20a

Drf

I just bought a vmg3312-t20a vdsl modem and router and can't for the life of me upgrade it's firmware. I downloaded all three of the available firmware upgrades from zyxel's site ABFX.0 ABFX.1 and ABFX.3 but when I try to upload any of them to the router I'm told that "Image uploading failed. The selected file is an illegal image."

As a side note I notice that the firmware currently installed in the router is designated (ABIV.2) instead of ABFX.?

Anyone have any idea what the problem is and how to solve it?

#CPE_Dec_2018

AAAAL

Hi Drf,

Firmware 5.30(ABFX.3)C0 is for xDSL Annex A version, your current firmware ABIV.2 is used in Annex B. We cannot upgrade firmware between them.

You may need to connect to your internet service provider for firmware upgrade request.