Updated my M8 Firmware/Radio just last nite. due to Viper Venom 3.0.1 needs and was actually paying for the "sunshine" help - which is rather unusual for me (FireWater Weaksauce etc. didn't work).
I am actually glad nobody here came up yet with a weekend occupying win81 on m8 step by step instruction or Dual Boot
BTW - Have a M7 32 GB Rooted S-OFF Viper Venom but cracked glass. Can ship in Europe or Switzerland. Works charming and has enough power for other "duties"