Using yoshi's minips2dev VM, the latest rev it pulls and compiles is r638, and I use it daily. All GH games work flawlessly from USB, SMB, and HDD outside of the intro videos (they're too high-bitrate for USB and even SMB to handle, obviously internal HDD eats these videos for lunch with room in it's mouth to spare, lol), but gameplay is perfect, even on the full-band games with more channels of audio being streamed (and even on Rock Band series where there is background video being streamed as well, lluckily they are lower bitrate and resolution).
Originally Posted by kadorna2
Chip-free homebrew <3
SCPH-39001, FMCB 1.8c, NA+250GB HDD
SCPH-75001, FMCB 1.8c
GSM 0.36 + OPL r639 = Gaming bliss ^_^