Accidentally erased first 256 sectors of drive

Szustarol

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Hello.
I was starting to develop my OS to get some hardware knowledge,
sadly instead of dd into pendrive, I have copied the image to my OS' drive.
I have tried testdisk using both Intel and EFI partition type, but It gives me
read error on every cylinder.
The drive contains very valuable data, I thought recovering from deletion of just 256 sectors
would be easy, but testdisk seems helpless.
Is there anything left to do?

Edit.
Photorec tries to recover data, but 0 files are found, and 0/10 headers are found. I tried xxd on the drive
and clearly there are non-zero bytes there.
 
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