I've flashed a lot of DSes over the years, and not had a single problem until now. I had to replace my old DS's mobo recently, and whilst I don't really need to install flashme anymore (my old Supercard SD is more novelty now than anything - though comes in handy for REIN), the heath and safety screen annoys me, so I figured I'd get rid of it and get all the other benefits of flashme as well should I ever need them. So I fire up the flashme 8a installer, it tells me the current firmware is v7 (I'll come back to that), and then I tried shorting SL1. Nope. Nada. Wiggled the screwdriver a bit, and off it goes. I'm well aware of shorting it out and the risk of blowing a fuse, but no, it's fine, so I tried again. And again. And again. No matter what I tried, it never once got off 0%. I scratched the pads a bit in case the surface had oxidised (my box of spare parts is somewhat old and lives in a cold garage), but no joy. Ultimately, I got somewhat frustrated and pulled the back cover off my DS, found a couple of vias I could use as handy seating points for my multimeter's probes, and confirmed I was in fact bridging SL1. I was. I also gave the pads a once over with a fibreglass pencil to seal the deal. With much awkward battery fiddling I even reran flashme with the cover off but again, it never got off 0%. I even tried using a resistor (~1.2k ohm IIRC) rather than a simple short, to no avail. Ultimately it dawned on me I could use my Acekard RPG to boot my old slot 2 card, so I gave up, but I don't like mysteries! Back to the firmware - Interestingly, going by the old wiki article, when I pop a game card out in Pictochat, I get magenta screens, suggesting I have v5 firmware, not v7 (which apparently only came on Mario edition DSes?)...and the host my mobo came from is just a bog standard black one. Bit weird. But definitely isn't already flashed.