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Adrenaline is the infamous ePSP hack for PSVita/PSTV consoles running firmware 3.60 with taiHEN/HENkaku. The main features of it are the ability to play PSP and PSX (with full sound) games but it also has many other features that make it the vastly superior over the normal PSP. These are is cool stuff you could do with Adrenaline:
You can use custom screen filters (not only the official Sony one)
You can do save states
You can run homebrew that requires 64MB of RAM
You can use plugins (such as CXMB)
You can easily update Adrenaline via Network Update in XMB as you would do on a normal PSP
Many other features!
Source
GitHub page of the update (changelog + download link)
Adrenaline Easy Installer v1.15 (updated for Adrenaline-5.1)
Adrenaline States manager (useful for not losing your save states)
You can use custom screen filters (not only the official Sony one)
You can do save states
You can run homebrew that requires 64MB of RAM
You can use plugins (such as CXMB)
You can easily update Adrenaline via Network Update in XMB as you would do on a normal PSP
Many other features!
Source
GitHub page of the update (changelog + download link)
Adrenaline Easy Installer v1.15 (updated for Adrenaline-5.1)
Adrenaline States manager (useful for not losing your save states)