The console was not locked before upgrading?
You are seeing errors when booting?
If it was running ZFS you can roll back the ZFE BE snapshot.
If it's UFS you could try a manual filesystem check:
https://docs.netgate.com/pfsense/en/latest/troubleshooting/filesystem-check.html#manual-filesystem-check
Otherwise a clean re-install to 24.03 is probably the quickest way back:
https://docs.netgate.com/pfsense/en/latest/solutions/sg-1100/reinstall-pfsense.html
Steve