It's just what I'm doing now.

Update: done!

I found coldboot files on fw 2.80 into dev_flash_012.tar.aa.2009_06_16_054149, dev_flash_013.tar.aa.2009_06_16_054149, dev_flash_014.tar.aa.2009_06_16_054149 and dev_flash_015.tar.aa.2009_06_16_054149.

You can find them here -> http://www.megaupload.com/?d=SI1D3FB2 pass: ps3news