Dovado tiny ac need help

hi every one. need help installing openwrt. problem is i can not access my router admin. bought like this. reset it and get 5ghz access but but switched to 2.4ghz and it gone.trying to reset again but wlan does not show up. default ip on lan not coneccting. tried with windows rescue, but no help. I Think the only way to install openwrt. The rescue program asking to set it up to push reset button for 10 sec. replug power cable and push rescue button. any clue how do i have to setup tftp or ftp sever or client to push openwrt bin? or maybe there is any other way?