Can someone tell me why my save says it's corrupted on Gen 2 VC?

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EDIT: For anyone else having this issue, I fixed it by doing this: I downloaded this and then simply dragged my "sav.dat" file onto the program, noticed that my "sav.dat" file very slightly went down in size, so I put this 'new' file onto SD card, and now it boots and works fine...

 

Gold Version. This is for VC. I downloaded the starter SAV that I wanted to use from below. I even tried the sav on my 3DS without changing any Trainer info, etc. and also tried deleting that "Secure" file (or whatever it's called) on my 3DS SD card.

I then modified TID, OT Name, added 12 Pokemon to Box 1, and gave myself a decent number of PokeBalls to use.

My "sav.dat" file opens perfectly fine in PkHex and emulators on my PC, but when I put the sav file onto my 3DS' SD card, restore the save via Checkpoint, and start the game up, it says the game is corrupted. How/Why? The file size on my PC of the sav says 32kb, so that should be ok.

 

My save file is attached below.

 

sav.dat

Edited November 17, 2020 by PkHexBoi