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PRO Firmware is a Aftermarket Firmware for Playstation Portable™.

It's licensed under the GPLv3, and thus is under full control of the community, made by users for the users.

It will continue to provide you with new features, even after Sony drops the plattform and allows you to develope your own applications for PSP. News Bulletin

08.05.12: Updated Binary Downloads with Linkbucks to help Prometheus Server Upgrade Funding.
06.10.12: Nightly Building Bot updated. Now produces properly working CIPL. 

Supported Kernel and Hardware Revisions

6.20 [1g, 2g, 3g, 4g, 5g]
6.35 [1g, 2g, 3g, 4g, 5g, 7g, 9g]
6.39 [1g, 2g, 3g, 4g, 5g, 7g, 9g]
6.60 [1g, 2g, 3g, 4g, 5g, 7g, 9g, 11g] 

Downloads

6.20 PRO-C2
6.35 PRO-C2
6.39 PRO-C2
6.60 PRO-C2
OpenCMA for PS Vita (1.69 and below)
OpenCMA for PS Vita (1.80 including error fix)
ciso.py Cross Plattform ISO Compressor
▾ OUTDATED FILES ▾ 

Most frequently mentioned features

Homebrew Compatible - Run your own unsigned applications, both user and kernel mode.
Plugin Compatible - Add new features to your PSP via kernel mode background plugins.
ISO / CSO Game Dump Playback - Backup your own UMD discs via USB and play them from Flash Storage.
2g+ Memory Range Unlock - Use the previously locked RAM range within your own homebrews.
NODRM Engine - Use your bought DLCs, no matter on which PSN account you are currently logged in.
PSX Emulator Unlock - Play your PSX classics, yes - all of them. Not just PSN titles.
And a lot more... 

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This is a clone of the ProCFW PSP firmware. Google code is shutting down, and Pro isn't updated very often - I'm exporting a copy for code preservation.

Since this is a rather important chunk of code. How else am I supposed to take screenshots, read manga, theme the heck out of stuff, or play cave story? ;p

From the BASLQC: Thanks to Chaoskagami for also exporting the Wiki pages by hand. Though you probably should have straight up grabbed the original wiki pages...