Currently I recommend you to clear the CMOS by removing the CMOS battery and the power supply cables from the motherboard and leave like that for 30-60 minutes. After this try the BIOS recovery on a freshly formatted flash drive that only has the .bio file on it. The flash drive does not require to be bootable.
If problem continues please go ahead and contact your local warranty department:
Thanks for the answer. I tried that without success . The only thing is that I downloaded ans used a ".BIO" file instead of a ".bio" file (there is a direct link to .BIO but there is also a .bio inside BHZ7710H.86A.0099.BI.ZIP file). Does the size and format from the USB Drive matters? I used a freshly formatted FAT32 8GB USB2 inside a USB3 port from the back panel (I also tried a USB2 port without success). I think I'll follow your advise and call my local warranty department.
Thanks for everything,