Cannot downgrade firmware on A9 router
My A9 cannot maintain a stable wireless connection to my devices(roku, 2-3 computers, 3-4 phones/tablets). This is expecially noticeable when streaming to the roku.
My A9 originally came with firmware version 1.0.6 Build 20200114 rel.73164. I performed an update a month ago. The flakiness started shortly thereafter. When I replaced the A9 with my old Tenda router, everything worked fine.
I tried to manually downgrade the A9 firmware to the previous, original version that was downloaded from the official site. All I see is an error dialog saying "Bad File Type" and it aborts the downgrade.
How do I accomplish the downgrade?