reflashing YUN

Hello, i been all day trying to make my yun work again but nothing…
I followed all the steps here https://www.arduino.cc/en/Tutorial/YunUBootReflash but it never worked. Is there any other way to put my Yun as factory settings??

The problems started when i tried to update the openwrt but due to some wifi connections the process was interupted and then i cannot make the YUN wifi work again.

Please help!
Thanks