Could you try if it also erases the save if you just turn on the Cart Reader without actually going into the GBA submenu. Just let it sit on the Cart Reader's main menu for a while and then turn it off again.
Could you try if it also erases the save if you just turn on the Cart Reader without actually going into the GBA submenu. Just let it sit on the Cart Reader's main menu for a while and then turn it off again.