The PSP Custom Firmware 6.61-Pro-C2 will work on all PSP models from the original PSP to the PSP Go and even the E1000, all you need is to be running the official 6.60 or 6.61 firmware to install and use this custom firmware.
Note: On the 15/01/2015 Sony released PSP firmware 6.61, some three and a half years after the last 6.60 update.
When custom firmware is on your PSP you can use emulators, homebrew applications and even backup your games to the memory stick.
This allows you to easily carry around more than one game, and helps to save your PSP's battery as it does not need to power the UMD drive when playing games.
The PSP® (Play Station®Portable) system software update will perform some changes on your current operating system as it may include new or modified features and settings, security patches and other items. Within the "PSP" folder, create a folder named "GAME". Download the update data for the PSP-1000/2000/3000 series and save it in the "UPDATE" folder created in step 2.
We recommend you to check this page on a regular basis for software updates as it is best for your system to use the latest version of the system software, allowing you to benefit from all the features of your PSP. It's recommended for all PSP owners to upgrade to the latest firmware. Prepare to save the update data on Memory Stick Duo™ media, using one of the following methods: Connect the PSP® system to the PC using the USB cable Connect a commercially available Memory Stick USB reader/writer to the PC Use the Memory Stick slot on the PC Create a folder for the update data on Memory Stick Duo™ media. Within the "GAME" folder, create a folder named "UPDATE". You must save the downloaded data as noted in these instructions.
PSP Firmware Update is provided as a free download for all software users (Freeware).
You can also add new features to your PSP via kernel mode background plugins, for example the ability to take screenshots in games.
You can also convert your old PS1 games and play them your PSP.
All PS1 games are supported, not just games on the PSN.
It's of no benefit to you updating to 6.61 after all this time, however the custom firmware has now been updated to support 6.61.So you can now follow this guide if you happen to have updated to 6.61.