OpenWrt Firmware for Archer c6 v3.2

sorry for noob question, but how can I flash A6 v3.2 with A6 v3 firmware, a get error "unable to upgrade" whet trying to flash from GUI ? can You give me direct link to bin file i should to use ?

I tried the tftp method but it doesn't work :(, please help

I have the same problem as the person above, I get the "unable to upgrade" error on my Archer A6 v3.2 when i try to upload the image via web GUI. Can anyone help with that error?