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 https://openwrt.org/toh/tp-link/archer_c6_v3#oem_installation_using_the_tftp_method
I flashed with "openwrt-22.03.3-ramips-mt7621-tplink_archer-c6-v3-squashfs-factory"