Sophos XG210 SFOS 18.5.3 Restore Backup to Virtual Appliance: extraction failed?

Hi, i have an XG210Rev on SFOS 18.5.3 MR-3-Build408 that i need to restore to the virtual appliance.

My appliance has also 2 RED attached and 14 Vlans.

I've downloaded the correct vm from sophos downalod (the same version, SFOS 18.5.3 MR-3-Build408) and loaded on an ESXi host and tried to restore the backup but i can't. It seems to me that the restore from a xg210 without flexi port should be ok to a virtual appliance.

I've tried adding 8, 10, 12 network cards (all VMXNET3)  but it cannot load the backup. The Passkey seems good (if i wrote it wrong the web gui complains that the format is corrupted or key is invalid)

I've tried also to check the logs and  get this error:

ERROR     Jul 18 15:38:44Z  [upload_restorefile:12444]: log_exec: Failed Command: /bin/mv $restorefilepath/$backupfilepath/backup.* $restorefilepath/$backupfilepath/$restorefilename
WARNING   Jul 18 15:38:44Z  [upload_restorefile:12444]: Action with NOFAIL Failed.

Looking better seems to fail to this command:

ERROR     Jul 18 15:54:28Z  [upload_restorefile:23999]: csc_execve: Child exited with status 1
ERROR     Jul 18 15:54:28Z  [upload_restorefile:23999]: log_exec: Failed Command: /bin/openssl enc -d -aes-256-cbc -md md5 -in $restorefilepath/$encfilename -out $restorefilepath/$bakupfilename.tgz -pass file:$file

If i try the same command on my windows machine i could decrypt the backup with no problem (where i can see that the "noofinterfaces" file contains 8, just to check if the problem was the number of network interfaces)

any hint on that??