Undelete files on Synology NAS

[Verkenner]

WOW! Unfortunately I deleted an important folder on a Synology (Raid1) NAS.
No recycle bin available. But the files are still available on the Disk. Disk has a EXT4-filesystem.

I want to undelete this folder. Preferably with a (cheap) program that works with WIN10.

What I did:
Put one diskdrive in a WIN10-PC.
Tried several programms: ReclaimMe, RecoverIT, EasUS Data revovery Wizard, Asoftech Data recovery, Recuva, Recovery Explorer Standaard, Testdisk/PhotoRec and Aomei backupper.
No succes (because I have little knowledge and no Linux knowledge).

Can anyone help me?
Many thanks, Verkenner (Drenthe)

[Akatar]

i would post this on twekaers.net they have a nas section.