2020.07-rc6 firmware not booting emmc

Hi, I just upgraded my firmware from 2020.07-r4 using LOST directly from the board, to what I supposed is the latest rc6 release. After the upgrade, I get the following message:
** Unrecognized filesystem type **
Foung 4 disks
BootOrder not defined
EFI boot manager: Cannot load any image
172032 bytes read in 5ms (32.8MiB/s)
error: symbol 'grub_calloc' not found.
Entering rescure mode...

I get prompted to grub rescue, no matter if I select Boot or Boot eMMC from the boot menu.

The image was fully functional before the upgrade. 
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