#1. Create on the root of a USB (formatted FAT 32) the following folders: \PS3\UPDATE\
#2. Which firmware is currently installed on your PS3?
If you're on 3.55 Official Firmware jump to step #3.
If you're on 3.55 CFW reinstall OFW from recovery mode then jump to step #3
If you're on 3.50 or less keep reading.
Rename the PUP inside the OFW 3.55 SONY folder (OFW3.55.PUP) to PS3UPDAT.PUP
Then put the renamed PUP into the folder you just create inside your USB‚ example:
Install PUP into the PS3 from XMB (Settings > System Update > Update via Storage Media)
#3. Now you're on Official 3.55 firmware its time to install the kmeaw custom firmware.
#4.Rename the PUP inside CFW 3.55 Folder (CFWkmeaw.PUP) to PS3UPDAT.PUP
Then put the renamed PUP into the same folder you just create inside your USB‚ example:
\PS3\UPDATE\PS3UPDAT.PUP (if asked to overwrite say YES)
#5. Go to Settings > System Update > Update via Storage Media and install the kmeaw Custom Firmware
note - if a message appear saying you already got the latest version turn the PS3 on Recovery Mode and choose System Update from the menu
#6. After reboot you should see the install package file and the app_home/PS3_GAME/ inside the Game Folder
#7. Add the package multiMAN to the root of any USB and install from the Install Package files option."