Hi everyone,
I've got a weird problem : I installed from a USB key Big Sur (from Opencore last version) on a USB hard drive (external). It worked.
I install with the same usb key Big Sur on the internal SSD. everything (install) went smooth until the first reboot. There I've got a windows with "le montage d'un volume requis a échoué" (sorry, I'm french); that's weird, how can it be possible ?
Thanks for your advises !