Until 5.00M33-4, DarK_AleX used Sony's 3.71OFW MS Driver to enhance MS speed at its custom firmware. Then he developed his own one. Although his patch doesn't work at 5.50GEN-B2, the 3.71 driver works fine Don't tested it much, but Soul Calibur CSO is loading 3 seconds faster. Tutorial: Tested only at 5.50GEN-B2 PSP Phat Installation: (Thanks to th3saint) 1- Download - Thanks again to th3saint and PoisonousMonk3y (maxconsole.net) 2- Attach the USB Cable to your PSP and, Turn it on holding R. Go to Advanced -> Toggle USB (flash0) 3- Access \kd\ folder at your pc 4- Backup these files: pspbtjnf.bin pspbtknf.bin pspbtlnf.bin And then put the new ones (all the five files of .zip, not just the 3 described above!) from the file you have downloaded. 5- Exit recovery menu and reboot your PSP after that 6- If you want reverse the process, just flash back your backup files @ \kd\ folder Original Post by PoisonousMonk3y PSP Slim Installation: ATTENTION: NOW IT'S REVERSIBLE! 1- Attach the USB Cable to your PSP and, Turn it on holding R. Go to Advanced -> Toggle USB (flash0) 2- Access \kd\ folder at your pc 3- Backup these files: pspbtjnf_02g.bin pspbtknf_02g.bin pspbtlnf_02g.bin 4- Download: FATMS MOD for 5.00 (also works at 5.50GEN-B2 as stated) 5- Put fatmsmod.prx on your MS root and FATMS371 folder at \PSP\GAME\ 6- Disable plugins, CXMB etc 7- Run FATMS Mod app, hit X and wait it finishes. 8- If you want to reverse the process, just flash back your backup files @ \kd\ folder If you can, please test speeds before and after install and post your results! Comparison Chart: Tested game: Valkyrie Profile at CSO (compression 9) at M33 Driver. Warning: Spoilers inside!