The GlitchTeam with the help of many others have shared a nice tutorial for dumping the Corona V2 NAND with an SD card reader.
Seems that the GlitchTeam along a team of hackers over at Dayton360Mods have posted a pretty nice method for dumping the Corona V2 NAND (with phison chip), using an SD card reader soldered directly to the NAND pin.
[QUOTE]
"A team of hackers from dayton360mods.com and glitch360key.fr has managed to load Xell on Xbox 360 with Corona v2 motherboard without swapping the 4GB NAND flash with a 16MB NAND flash, instead using an MMC/SD card reader to partially dump 16MB of the 4GB NAND flash and then NandPro to convert the raw image for compatibility with common build tools before writing it back."