Cannot boot GuixSD after system reconfigure

[Roel Janssen]

config.scm
Description: Binary data

Dear Guix,

I 'guix pull'ed commit 228a398 and ran:
  guix system reconfigure /etc/config.scm

It looks like GRUB cannot find my root partition (/dev/sda3).  So, I
suspect that something has changed regarding specifying the partitions (UUIDs?).

I attached 'config.scm'.

Now, the hardest part.. How can I recover?  It doesn't boot the older
generations either, so I now use a Fedora live USB.

Any pointers are appreciated.

Thanks!

Kind regards,
Roel Janssen