thing is, that I do not have 450. I'm going to buy an, but why to buy $200+ video card, when card for ~70$ will work better? My only use is in 3d modeling ("pro" use; and usually quadros have twice performance in it than game cards with similar price). And if flashing will gain at least 30% of it - will be really great.
Thing is, I guess you know, that 450 and 2000 are pretty same, with bit different voltage and output ports.
If bricking doesn't mean destroying and only making it less usable - I can revert BIOS, right?
Yep, bricking means the card is dead and usually can't be recovered. If you need a Quadro, then buy one. Trying to convert a 450 into one is likely to fail. I know they are similar, but they are not the same.