Not just one, two… The first comes from joshd666, while the other comes from bosshunter, who you may recognize from the earlier CFWEnabler iR Shell patch. So try ‘em both and you decide what’s best.

joshd666’s patch:

1. Copy the IRSHELL directory to the root of your memory stick;
2. Copy the irshell2×3x directory to PSP/GAME; That’s it, that’s all.

bosshunter’s patch:

1. Make sure you have:
   • iR Shell 5.0 installed;
   • The plugins loaded by game.txt are disabled;
   • Replaced the IRSHELL folder with the one provided.
2. Run iR Shell.
3. Open Directory View and go to ms0:/IRSHELL/PATCH/5.50/.
4. Run btcnfpatch.prx.
5. Follow the onscreen instructions.
6. Wait a few seconds. You should see a similar screen to the screenshot above upon success.
7. Re-enable your game.txt plugins.
8. Enjoy iR Shell.

I tried both on 5.50 GEN-A, and personally I’m sticking with bosshunter’s method. For some reason or other joshd666 is using iR Shell 3.9.

Download:
iR Shell 5.0
bosshunter’s iR Shell Patch
joshd666’s iR Shell Patch

- source: qj