Boot order gone after powerloss or disconnect psu

The CMOS battery has no function on this board

Is that thing that dumb??? I just unplugged the power to get back to BIOS to enable VT-d, but then noticed I lost my grub config as I installed Proxmox on an SSD to avoid to put it on the emmc. Now the only thing I can do is boot in the default CasaOS and I am unable to get back to my Proxmox setup!

Is there a way to:

  1. Fix that issue?
  2. Prevent that does not occur on any power failure?