Take 15 minutes and read up on how to flash your BIOS and the steps needed to recover from a bad flash, what sounds or onscreen messages (if any) your computer will make during the flashing process -- weather successful or failed flash. Get all your materials prepped (disc/USB with any flashing tool and a clean BIOS, and a second with the modded BIOS) before you even make your attempt... then flash and be patient. If anything goes wrong, try to recover using the modded BIOS, and if that doesn't work, try recovering with the clean one. So long as the BIOS is the correct one for your motherboard, you should be all set -- especially if others have verified it's good. Flashing your BIOS isn't that hard or dangerous, just be smart and prep.
I suggest to wait one more day. I have no confirmation myself about the loaders. I also don't know about what loader was talked about.... Anyway a already confirmed mod would mean the same risk as to flash a ordinary biosupdate.... .....and yes no SLP key is reported to be blacklisted so far....