I tried installing a customized openwrt on my new Beryl, When I did go to uboot screen I uploaded a file (definitely wrong file) then clicked install but it went black and now there is no lights on my router and I tried again getting to uboot several times but since it has no lights I cant get it to work.
Good to know, there is no other recovery possibility. I really have to remeber this: NEVER flash a wrong uboot file. Triple check if it is the right uboot file.