Today Adrenaline 6.61 is released which is a PSPemu Custom Firmware (CFW) modification of Sony's official PSP Emulator for TaiHEN on PS Vita by PlayStation Vita homebrew developer TheFloW with details and updates linked below! 
Download: adrenaline_fix.zip (138.1 KB) / adrenaline_fix2.zip (138.2 KB) / GIT / adrenaline.rar (Design) (125.13 KB) and AdrenalineEasyInstaller.vpk (659.78 KB) by freakler94 / 6.61 Adrenaline-2 Custom Firmware / PSPInstaller (Adrenaline Edition) / Adrenaline 6 M1 English Version by theheroGAC
From the 6.61 Adrenaline ReadMe.txt to quote: 6.61 Adrenaline
A software that transforms your PS Vita into a two-in-one device
About this release
I have decided to release Adrenaline earlier than planned since I'm going to have exams soon and therefore won't have time to do anything for the scene. I will take a break until February and will return back to add the remaining features for Adrenaline. Wait, what is remaining?
This release of Adrenaline does not have all features that I have been talking about. The reason therefore is that I want to have a stable v1 release first before adding more things. These features are not included yet:
I hope that you understand and respect my decision. If not...then I don't understand YOU
What is Adrenaline?
Adrenaline is a software that modifies the official PSP Emulator using taiHEN CFW framework to make it run a PSP 6.61 custom firmware. Thanks to the power of taiHEN, Adrenaline can inject custom code into the IPL which allows unsigned code to run at boottime.
What does Adrenaline currently support?
Adrenaline has got most of the features that a real PSP with CFW has got:
Example of config.txt:
Note that you replace TITLEID by the titleid of your PSP game (the name of the folder where EBOOT.PBP is).
You can switch tabs using L/R triggers, UP/DOWN to move, X/LEFT/RIGHT to change options and START/O to close the menu.
About custom graphics filtering
Right now, you have got four different options you can choose:
The right analog patch for GTA LCS/GTA VCS will be downloaded from here: https://github.com/TheOfficialFloW/GTA_Remastered
Don't think that any other games will now have right analog stick patch too
Donation
If you wish to donate me some money, I'd really appreciate. But just don't write thanks for PSP backups
Download with 661.PBP FIX
https://www.mediafire.com/?8w3zsjw61k9ehb2
Download with 661.PBP and C1-2858-3 crash on MINIS FIX
http://www.mediafire.com/file/tk1f9u96lzkthno/adrenaline_fix2.zip
Here are some PS Vita ARK-2 / ARK-3 eCFW mirrors as well for those interested:
Spoiler
Thanks to @torytyler for the heads-up in the PSXHAX Shoutbox!
Download: adrenaline_fix.zip (138.1 KB) / adrenaline_fix2.zip (138.2 KB) / GIT / adrenaline.rar (Design) (125.13 KB) and AdrenalineEasyInstaller.vpk (659.78 KB) by freakler94 / 6.61 Adrenaline-2 Custom Firmware / PSPInstaller (Adrenaline Edition) / Adrenaline 6 M1 English Version by theheroGAC
From the 6.61 Adrenaline ReadMe.txt to quote: 6.61 Adrenaline
A software that transforms your PS Vita into a two-in-one device
About this release
I have decided to release Adrenaline earlier than planned since I'm going to have exams soon and therefore won't have time to do anything for the scene. I will take a break until February and will return back to add the remaining features for Adrenaline. Wait, what is remaining?
This release of Adrenaline does not have all features that I have been talking about. The reason therefore is that I want to have a stable v1 release first before adding more things. These features are not included yet:
- 64MB RAM
- PS1 games support
- Ability to use ur0 as Memory Stick File System
- Savestates
I hope that you understand and respect my decision. If not...then I don't understand YOU
What is Adrenaline?

What does Adrenaline currently support?
Adrenaline has got most of the features that a real PSP with CFW has got:
- XMB
- ISO/CSO
- Homebrews
- Plugins
- VshMenu, Recovery menu
- And more
- Ability to take screenshots using PS + START
- Ability to use the PS button as HOME button
- Ability to use a custom graphics filter
- No file system limitation by using a custom msfs.
- Install any PSP game/demo onto your PS Vita (compatiblity for PS1 games as bubble will be added in the future).
- Shutdown your PS Vita and visit http://beta.henkaku.xyz/.
- Launch molecularShell, press START and set 'Enable unsafe homebrews' to 'On'.
- Reboot your PS Vita and then install VitaShell from molecularShell (https://github.com/TheOfficialFloW/VitaShell/releases).
- In VitaShell open FTP by pressing SELECT and copy the 'adrenaline' folder from the archive and paste it at 'ux0:pspemu/'.
- Download the 6.61 EBOOT.PBP (for 1000/2000/3000) from the Sony server (google it) and paste it at 'ux0:pspemu/adrenaline/661.PBP'.
Code:
*KERNEL
ux0:pspemu/adrenaline/adrenaline.skprx
*TITLEID
vs0:sys/external/libpgf.suprx
ux0:pspemu/adrenaline/adrenaline.suprx
Code:
# You must reboot for changes to take place.
*KERNEL
ux0:pspemu/adrenaline/adrenaline.skprx
*main
# main is a special titleid for SceShell
ux0:app/MLCL00001/henkaku.suprx
*NPXS10015
# this is for modifying the version string
ux0:app/MLCL00001/henkaku.suprx
*TITLEID
vs0:sys/external/libpgf.suprx
ux0:pspemu/adrenaline/adrenaline.suprx
- Reboot your device and revisit the page I have mentioned above.
- Launch the game for which you have added the plugin's line to config.txt.
- Follow the instructions on screen.
- Enjoy
- Hold the PS button until the 'Quick menu' appears and choose 'Settings'.
- This button will not open the official PSP settings menu as usually, but it will open the Adrenaline Menu instead (the official Settings menu will be accessible within Adrenaline Menu)
- As I have mentioned, the PS button will be used as HOME button, thus pressing it will not let you go back to the livearea. The only way you can exit the PSP Emulator is by clicking the 'Exit PspEmu Application' option.
You can switch tabs using L/R triggers, UP/DOWN to move, X/LEFT/RIGHT to change options and START/O to close the menu.
About custom graphics filtering
Right now, you have got four different options you can choose:
- Official: If this is selected, the official filtering will be used (the one choosed in the official settings).
- Bilinear GPU: The filter being applied by GPU does look a bit smoother than the official bilinear filtering.
- Sharp bilinear: This filter is an improved bilinear filter where scanlines are added to give it a sharper look.
- LCD3x: This filter has got vertical and horizontal scanlines and will make the screen a bit darker.
The right analog patch for GTA LCS/GTA VCS will be downloaded from here: https://github.com/TheOfficialFloW/GTA_Remastered
Don't think that any other games will now have right analog stick patch too
Donation
If you wish to donate me some money, I'd really appreciate. But just don't write thanks for PSP backups
Download with 661.PBP FIX
https://www.mediafire.com/?8w3zsjw61k9ehb2
Download with 661.PBP and C1-2858-3 crash on MINIS FIX
http://www.mediafire.com/file/tk1f9u96lzkthno/adrenaline_fix2.zip
Here are some PS Vita ARK-2 / ARK-3 eCFW mirrors as well for those interested:
Spoiler
Thanks to @torytyler for the heads-up in the PSXHAX Shoutbox!