GTX 770 Lightning vBios recovery and other questions

Question

Hey I was just wondering, is 70C too hot becau- Just kidding.  Haha, gotcha.
Actual Question: I was messing about flashing higher and higher power/memory/clock settings and I went too high. Just as I get to the betta fish loading logo (I'm using the 8.1 preview) the screen goes black but does not sleep and I'm stuck there. So now I get to use the LN2 switch to boot, (I JUST researched LN2 and realized what I've been missing) but how do I flash a Normal mode vbios when I can only run in LN2 mode?
Also, just to be 100% safe: A UEFI/GOP vBios is backward compatible with a legacy MB right? I want to make sure I have a vbios to boot with. MY actual computer is an obnoxious Inspiron 546 from 2009... yea. I'm just borrowing this rig. The 770 is MINE though. 
Another issue I cannot understand is that whenever I reach 99% GPU usage under ANY (Normal) vBios settings in ANY game with ANY driver the game freezes and crashes and MSI afterburner occasionally reports something crazy like 90129374% Power in a spike. I was actually trying to work around that by overclocking so much I'd never reach 99% GPU usage, but it still spikes for a split second and crashes me.
Finally, I'm highly curious about this vbios entry on techpowerup http://www.techpowerup.com/vgabios/141424/msi-gtx770-2048-130605.html The other two MSI GTX770 Lightning vbios's on this page http://www.techpowerup.com/vgabios/index.php?manufacturer=MSI&model=GTX+770 are the Normal and LN2 vbios's as it states at the bottom, but that third one says nothing on the bottom, and to further increase curiosity the version number has a more significant change in it. Has something been updated?
Oooh yes, one last thing. I've think I might have come across a bug in Svets vBios Tuner (2.49h). I can't set any P*state  higher than 2040 because I get a 'wrong parameter' error with anything above that. I used Kepler Bios Tweaker 1.25 to set it to 2104 and that worked, but appears as 4 in both Kepler Bios tweaker and Svets Tuner after that.
I know this is a lot of questions at once here, but I tend to save 'em up for a while. Thank you in advance. -Eli

Answer 1

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but how do I flash a Normal mode vbios when I can only run in LN2 mode?
If you have a non-nvidia vga left you can install it besides the lightning and use it for primary display. Then just use nvflash as usual to reflash a normal vbios (of course card needs to be switched to normal) and it will flash the nvidia adapter it finds (the Lightning). If you only have another Nvidia card left you'd have to identify the adapters name you want to flash (type nvflash --list and all adapters are listed). If then wanting to flash add the adapter name before the file to flash, e.g.: nvflash i1 vbios.rom (assuming i1 is the Lightning's name and vbios.rom is the name of the file to flash). Nvflash will then just flash the Lightning.
If you have no other vga you are out of luck. A PC-Shop can recover it for you.
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Also, just to be 100% safe: A UEFI/GOP vBios is backward compatible with a legacy MB right?
If the board is really legacy bios (no UEFI at all) then theoretically yes. Of course the board needs to be compatible to the latest GTX770 series cards. Old mainboards might run into compatibility issues apart from the vbios.
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Another issue I cannot understand is that whenever I reach 99% GPU usage under ANY (Normal) vBios settings in ANY game with ANY driver the game freezes and crashes and MSI afterburner occasionally reports something crazy like 90129374% Power in a spike. I was actually trying to work around that by overclocking so much I'd never reach 99% GPU usage, but it still spikes for a split second and crashes me.
Then your card is for whatever reason not stable (e.g. insufficient power supply, software issue, too much cpu overclock or simply the card not making factory settings - rma issue -).
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Finally, I'm highly curious about this vbios entry on techpowerup http://www.techpowerup.com/vgabios/141424/msi-gtx770-2048-130605.html The other two MSI GTX770 Lightning vbios's on this page http://www.techpowerup.com/vgabios/index.php?manufacturer=MSI&model=GTX+770 are the Normal and LN2 vbios's as it states at the bottom, but that third one says nothing on the bottom, and to further increase curiosity the version number has a more significant change in it. Has something been updated?
Don't download vbioses from third party sites. The uploaders mostly have no clue of these files themselves. There is nothing newer than you got from Svet. Don't experiment.
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Oooh yes, one last thing. I've think I might have come across a bug in Svets vBios Tuner (2.49h). I can't set any P*state  higher than 2040 because I get a 'wrong parameter' error with anything above that. I used Kepler Bios Tweaker 1.25 to set it to 2104 and that worked, but appears as 4 in both Kepler Bios tweaker and Svets Tuner after that.
Then contact Svet about it or post in the thread for his tool: https://forum-en.msi.com/index.php?topic=148273.0