Thanks for the detailed post. Yes, I actually did get the cart restored very shortly after I started this thread. I took it to a local retro gaming store that does repairs. They removed some of the excess solder from my attempt at a repair, and replaced the battery. As far as I know, that's all they did, and it works perfectly fine now. As to why this resolved what was seemingly an issue with the flash memory, I have no idea. But hopefully the problem won't rear its ugly head again.