WARNING: Do not use this on 3xxx/4xxx PS3 models (aka Late Slim models / SuperSlim), you will brick those consoles!
Also, this is only for PS3 with previously installed OFW 4.82, not CFW.
Team PS3Xploit over at psx-place.com has released software tools for dumping and writing NOR/NAND flash on PS3 consoles with original firmware (OFW) 4.82 based on the previously released webkit exploit! Dumping supports both OFW 4.81 and 4.82. The PS3Xploit development team behind this impressive feat consists of: W (nonoscript, Research & Testing), esc0rtd3w (Debugging, Research & Testing), habib (ROP & Debugging), bguerville (ROP/nonoscript & Debugging). These tools allow dumping, patching and overwriting original firmware (OFW) 4.82 with a custom firmware (CFW). If the QA flag is enabled after installing CFW 4.82 it can also be downgraded to lower CFW version. However, not all PS3 models are supported, here's a brief list of the currently supported ones...
Dumper: PHAT models supported; H=NOR, J=NOR, K=NOR, L=NOR, M=NOR, P=NOR, Q=NOR. SLIM models supported; 20XX = NOR, 21XX = NOR, 25XX = NOR, 3XXX = NOR, 4XXXB = NOR, 4XXXC = NOR.
Writer: PHAT models supported; A = NAND, B = NAND, C = NAND, E = NAND, G = NAND, H = NOR, J = NOR, K = NOR, L = NOR, M = NOR, P = NOR, Q = NOR. SLIM models supported; 20XX = NOR, 21XX = NOR, 25XX = NOR (fw 3.56 and lower).
Warning: Do not use this on 3xxx/4xxx PS3 models (aka Late Slim models / SuperSlim), you will brick those consoles! Also, this is only for PS3 with previously installed OFW 4.82, not CFW.
There is a chance of bricking your console, just be aware of the risks. For more info check the news post over at psx-place.com. The files can be downloaded here at EurAsia.