Mikrotik RB750GL root passwd reset


I have a Mikrotik RBL750GL with openwrt installed following this guide:

I did this some time ago and unfortunatelly I lost root password. I followed the guide to go to failsafe:

but can't login. I feel like that when it should start the 10-per-second blink it gets restarted. Also followed the installation process again from the beggining but still the same with login. TFTP rom is downloaded (also checked the sum) but can't see any difference and can't login again. I feel it can't get to recovery.

I thought that following the installation process should do it so my question is. Is there anything that I'm missing with this board? Does how I did the install can effect on the recovery process?

Many thanks.