PBX in a Flash 2.0.6.1.1 (32-bit) features CentOS 6.1 and provides your choice of Asterisk 1.8 (PIAF-Purple) or 2.0 (PIAF-Red) plus your choice of either FreePBX 2.8, 2.9, or 2.10. If you wish to install Incredible PBX 2.9, make sure you use this 32-bit ISO and choose PIAF-Purple and FreePBX 2.9.
For the Definitive Installation Guide, see this Nerd Vittles article: http://nerdvittles.com/?p=787
For the Incredible PBX Installation Guide, see this Nerd Vittles article: http://nerdvittles.com/?p=789
MD5 (pbxinaflash20611-i386.iso) = 24d5e6afa2278b85d70f21e60511289e