Got this system in Jan 2021, loved it

Just updated it to 1.5.1 Build 20210204 Rel. 50164  and o boy It literally messed up the system

Before this firwmare I was getting 500 to 600 Mbps all across the house on a 1 gig internet

Now after the update, barely 25-60 mbps

I want to downgrade it to my previous firmware, Can someone please detail the steps ?

Apparently logging into your gateway and uploading the old firmware did not work. Said you cannot downgrade

So reaching out to the community for help

Thanks

DecoLover