Flashing/installing on linksys ea7500 v3 without USB-to-UART

Hi,
is there a method of installing on Lynksis ea7500 v3 without USB-to-UART?

I tried to upload the upgrade file downloaded from the table matching line of device and it failing saying firmware file won't work...

i was trying to get usage of an old router lying at my old stuff box - I'm not sure if it's worth it to buy this new adapter.

Thanks,
Shlomi

A post was merged into an existing topic: Linksys ea7500 v3 - "This firware file won't work on this router"