I need help uploading my gba cart file onto pkhex

[Jawspinner]

I need assistance with getting my gba cart save file of fire red onto pkhex, as I want to play around with the save file. When dumping the save and uploading the file to pkhex, I got this error and now im confused. Can anyone help me? 

[Kaphotics]

Bad dump. Gen3 save files are MUCH larger than 8KB.

[Jawspinner]

I changed the file size of the save but still not working. What does it this mean?