Help With Archer C6 V3

Can someone help me? I installed openwrt in my router, but after that i can't acess it anymore, there's no gateway. I need help for going back to the stock firmware or one openwrt that works, thank you in advance.

which image did you use, when you flashed it ?

you could try the TFTP flash described at

I flashed with "openwrt-22.03.3-ramips-mt7621-tplink_archer-c6-v3-squashfs-factory"