ZFS Recover one file after format and install new OS

Hello,
Not losing time on prolonging..
OS: Freenas 11
Media: USB stick
Problem: My FreeNas has been crashed. I downloaded new (11.1U1) and normally install it (with stick fast format). After that when i upload my config backup i figured out that something not working fine... It is problem with importing my encrypted storage disk. The backuped config dont have geli.key used to decrypt the storage.

Question: I'm not specialist in ZFS, is any method to recover this file (size is about 64bytes, raw data without any header). Partition structure are the same, most data too. I think that is much possibility that the file are not overwritten. I do image of usb drive 5minutes after installation, and only thing what i do is upload my config backup. In ntfs,fat,ext2 i know how to do that, but i dont have any knowledge about ZFS.

Other info: I know the file name and location, file is about ~6 month old.

Best Regards
 
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