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1. Extract the files from the download above to the desktop. There should be two folders, one called "Jailbreaking Files" and one called "Downgrading Files"
2. Connect your TI-84 to the computer and connect it with TI-Connect
3. Open up the "Downgrading Files" and drag the one that says "PS3JB.8xk to TI-Connect onto your calculator
4. Go to your "Downgrade Files" and open up "Modified 3.41 PUP". This is the 3.41 firmware
5. Drag the file inside of that to your USB Drive
6. Now open up the "Lv2diag.self FILE 1" and drag that file to the USB Drive as well
7. You may now remove your Flash Drive
8. Now close that and open up "Jailbreaking Files" and drag the PS3JB.8xk toy our applications on the TI-84. They look the same, but this one is the JB and the other one is something else
9. Go to your PS3 with the calculator and the USB Flash Drive
10. Make sure your PS3 is OFF. Not by unplugging the cable or flipping the switch, just off
11. Now plug in your calculator
12. Go to APPS --> PS3JB (Not PS3JB_H) --> Options (5)
13. Now scroll down to "Emulate Jig" and make sure it is on and press the y= button to save it
14. Now press 1 to start the downgrade
15. Now on the PS3, press the power button then quickly press the eject button
16. Now your PS3 will automatically shut off
17. Unplug the calculator
18. Now make sure your PS3 is in Factory.Service made by turning it on, and if it says "Factory Service Made" in a big red box, you did it right
NOTE: You will have to resync your controller(s)
19. Now turn off the PS3 VIA the controller (Hold PS Button and turn off)
20. Now plug in your Flash Drive to the furthest right plug on the PS3
21. Now repeat step 15
22. Now your PS3 will hang around a black screen for about 5-10 min. Your PS3 is being downgraded
i upgraded to 3.55 so will this work for it or no

No it won't work.

That's all I gotta, use the search for more info -__-

NO! You cannot downgrade on 3.55 as of yet. However it should eventually be possible seeing as how fail0verflow showed how to get the private key. Have patience and don't update!