PSP Softmodding: How to install PRO-B10 in a dualboot with ME

What is this?

This is a tutorial on how to dualboot 6.60 ME and PRO on your PSP.

What do I need?

You will need the following:

• A PlayStation Portable 1000 or older 2000 (non TA-088v3) model handheld
• A computer with internet access
• An archiving utility (eg. 7zip)
• A standard USB to USB mini cable
• PlayStation Portable charger
• Memory Stick Duo with at least 1 GB of free space
• OFW 6.60

What do I need to do?

Step 1: Download the CFWs

You need to download the ME and PRO B10 firmwares onto your computer.
6.60 ME-1.8

6.60 PRO-B10

Step 2: Copy onto Memory Stick Duo

Connect your console to the computer using the USB cable and activate USB connection.

Copy the UPDATE folder from the folder in the release_660me_18.zip file to G:\PSP\GAME (assuming G: is the drive of your PSP).

Copy the PSP folder from the 660PRO-B10.rar file to G: (assuming G: is the drive of your PSP).

Step 3: Installation

Disconnect your console from the computer. Go to the XMB Game menu and to Memory Stick.

a) Launch "PSP(TM) Update ver 6.60".

If the console says that the game failed to load, skip to b), then try a) again.

If the console displays a black screen with white text press X.

ME 1.8 will now install. If you are not redirected to the XMB, press X.

b) Select the Memory Stick and select the unnamed game (with the smaller picture saying pro Update).  

When text appears on the screen, if the text is white with a black background press X.

PRO-B10 will install. Press X.

The console will return to the XMB.

Step 4: Using the CFWs

Go to the XMB Settings menu > System Settings > System Information. 
If the System Software is "6.60 ME-1.8", skip a) and go to b).
If the System Software is "6.60 PRO-B10" go to a), then to b).
a) Exit the settings and go to the XMB Game menu. Press Select and scroll down to "RECOVERY MENU   ->". Press X. Now scroll to "Reset device" and press X. The system will now reboot.
b) Now, by default, ME will boot automatically, as PRO-B10 is a Light CFW, meaning it runs on top of other firmware when launched. However, ME is a direct firmware patch, and will only work on PSP 1000 consoles and some older 2000 models, due to changes in the motherboard in later models. However, if you ever want to boot into PRO-B10, just run the "660 PRO-B Fast Recovery" in the XMB Game menu > Memory Stick with your softmodded stick inserted to boot into it.

And now you're done!

That was easy, wasn't it? Check back for more softmodding tutorials!