So i was trying to recover a failing drive by doing some tests.
This drive was connected externally.
After some trial and errors - I decided to 'write changes' after going into the EFI GPT category using TestDisk.
I wrote changes, reconnected the drive, now the formally NTFS drive now shows 1234F on bootup.
Instead of detecting the drive as 'Intel' testdisk now detects it as 'EFI GPT partition table type'. Gparted shows the entire drive as 'unallocated'. Is there a way I can reverse this? If not, can I still get the data back by using some recovery tools?