Npc restore backup fail with php version mismatch

Hi,
I’m trying to restore a backup (with ncp 1.53.0) but it fails with

Running nc-restore
check free space...
extracting backup file /media/USBdrive/ncp-backups/nextcloud-bkp_20230408_1680922803.tar.gz...
restore files...
Restoring old '/var/www/nextcloud/data' to '/var/www/nextcloud/data'...
restore database...
No datadir found in backup
This version of Nextcloud is not compatible with > PHP 8.0.<br/>You are currently running 8.1.26.Cleanup...
Done. Press any key...

The backup was done with an older version of NCP that I’m not able to install anymore (See How to get older Nextcloudpi images - #2 by stereo).

I still have a (presumably) intact ncdata dir that I would like to reuse.

Can php be downgraded such that the backup might work? Trying to restore a snapshot gives the same php version error that you see above.