r7000 bricked after flashing tomato ?

Hello everybody,

My R7000 has got many wifi issues, so i tried to switch to advanced tomato, with a tutorial video on the official site. After the flash, my R7000 boot fine, i can see the led white of the power, 2.4 ghz, 5 ghz and the first ethernet port. But i can't connect me to him, i don't receive any ping of the router, except at the start or i get 4 ping, and that's all. I don't understand because i can see the wifi access point, i can connect to them, but no connection.

I try TFTP, so success because i have no answer of the router.

Any others solutions ? I don't want to buy TTL cable :(

Thank's in advance :)