Tried your Nano BIOS right now at my MSI, the conservative 100/100 version.
Flashed, reboot -> Game over. No screen, no windows, 100% fan speed, thats all.
Flashed back the org. ROM after using dual BIOS switch at card, fortunately it runs again now.
So "thanks" for the fright and 1/2 hour wasted mining time.
You must have done something wrong then.
I have flashed all of my cards (100) several times. So i've probably flashed over 300 times already. NEVER had 1 problem.
There are a lot of others here that are using my rom, ask them, they are running it and do not have any problems.
Before you start flaming, read the previous posts from other users and perhaps ask some questions.
I'm here to help where i can with what i can.
1. Flash the stock rom back to your secondary bios, boot it from there, see if it boots.
2. If it does. Good. Flash the -100mV core, -106mV mem rom and COMPLETELY shut down your system, do not reboot, SHUT DOWN.
3. If this does not work, then it's probably a faulty bios, but definitely NOT the rom! I do not know for sure, but it "Could" be that MSI is different, although that i seriously doubt that.
4. If it does boot, completely remove your drivers, (DDU "display driver uninstaller"), also remove any oc software like Trixx, AB, ...
If you have any problems, questios, just ask, i'm here to help.
Greetings
Edit: Reuploaded the roms with a not so heavy underclock on the memory part.
-100mV Core Clock, -50 & -100mV Mem Clock