Janusz, this is the recipe from the Testdisk wiki for recovery.
Please study a little before you use it.
Good Luck
Moss
Recovery of reformated partition
If the partition has been reformated to another filesystem (FAT32 formated
as NTFS or vice-versa),
* run TestDisk,
* select the harddisk, the partition type
* choose Advanced
* select the partition
* choose Type,
* enter the value corresponding to the previous filesystem
* choose Boot
* choose RebuildBS
* List
* If you can see your files, choose Write and confirm
* In Analyse, choose to rewrite the partition with the correct
partition type.
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