What is it? Currently it is a firmware patch that allow you to start from GBA cartridge without requiring a PassMe in the DS slot.
- You need to have PassMe or WiFiMe already running to get it. You must enter a unique firmware ID to download the patch - an ID you can get by running unauthorized code from the GBA cart.
- Great installation instructions available from Lynx
I'm doing mine today and will let you know how it has worked out...
Update: It isn't tough to do, or dangerous, or even lengthy. I recommend FlashMe whole-heartedly. The Lynx tutorial will serve you well...the only stumbling block I had as a newcomer was some difficulty successfully "shorting" the neccesary connection. I realize that I'm addressing an audience of newcomers who either built or purchased a passthrough...so perhaps I'm alone in my ignorance.
Lynx's video never quite turns the DS all the way round so you can see how he shorted the connection that permits you to replace the firmware - but the updater itself is very responsive. I tried a screwdriver, flatscrew, and jumper wires without success. I eventually was able to fidget together a sufficient short by using a bent paperclip arched between the red/white square and the exterior screw nearest the L shoulder button.
First reboot - worked like a charm. I'm doing Theo's when he gets his writable GBA cart.