My brother recently started getting a message on Pokemon Red saying "The File Data is Destroyed" / taking him to a main menu screen with no continue button.
He is playing on an authentic Pokemon Red cartridge, had its battery replaced within the last 2 years, and playing on a regular Gameboy Color.
I have a GB Operator, so I downloaded a backup copy of the game / his save, and can verify that it will continue to give that message even when I try to play it on mGBA.
I cannot open the save on PKHeX, and I tried to open it with a Hex Editor (HxD) but I have zero experience with it, so all that I could really tell is that the save file looks really off when compared to other test save files that I either made myself or downloaded to try and compare.
I attached the save file here - would someone be able to tell me if this is recoverable at all?
Pokemon - Red Version (USA, Europe) (SGB Enhanced).sav