After choosing DHCP on a freshly installed OpenWRT firmware, the router stopped responding and 192.168.1.1 does not respond either. How to return?

Question

network hardware

I flashed OpenWRT, went to 192.168.1.1, set a password - chose a dhcp connection and that's it ... the page stopped responding, like the whole 192.168.1.1. Rebooting the router didn't help. At least go back to stock...
TP-link 740n
PS In the connections there is a certain "169.254.86.90" - ping goes with it, but through the browser - nothing sensible...

Answer 1

Routers have a reset button, which, when held for a certain time, resets to factory settings. If I'm not mistaken, then 10-15 seconds.