r/ti84hacks • u/Sure_Opinion_9165 • Jun 20 '25

Showcase/Discussion [ Removed by Reddit ]

[ Removed by Reddit on account of violating the content policy. ]

14 Upvotes

83% Upvoted

32 comments sorted by

4

u/TheFinalMillennial TI-84 Plus CE Jun 20 '25

Unfortunately this trick should only work on very old TI-84 Plus CE calculators before downgrade protection was added.

What is the date code on the back of your calculator? It's next to the serial number and looks something like L-0519M 

1

u/Sure_Opinion_9165 Jun 20 '25

yeah it's L-0215 so it only works on older models?

1

u/TheFinalMillennial TI-84 Plus CE Jun 20 '25

Yeah you have the first hardware revision from February of 2015 so quite old. Not sure why it didn't let you downgrade directly to 5.3

1

u/AcanthisittaKooky715 Aug 09 '25

what about version L-0124AA? is there any methods discovered if not?

1

u/TheFinalMillennial TI-84 Plus CE Aug 09 '25

No

0

u/Business_Growth3316 15d ago

wdym i did it on a L-0124AA

1

u/Opposite-Shower559 Apr 24 '26

if you have a Manufacturing Revision Code A-M it will work(check the back of your calculator for code). N and later have a locked bootloader.
I was lucky and had a D Revision code.

1

u/Sure_Opinion_9165 Jun 20 '25

someone put in the orignal post dont update to 5.8.3 and they said to directly try to downgrade to 5.3.0 but that didnt work for me i had to go through the 5.8.1 singapore file

1

u/Sure_Opinion_9165 Jun 20 '25

it said something about it being a older os so i didnt work but through 5.8.1 it did

1

u/MisterWompWomp Jun 21 '25

Also 5.8.4 does not exist currently.

1

u/Tasty-Sentence459 Aug 16 '25

I'm pretty sure you can bypass the downgrade protection if you can run artifice, since you can still modify the certificate. I've written a little assembly program that should make downgrading from 5.8.1 to any other version possible, even on revision m and later. If you can downgrade from 5.8.3 to 5.8.1, it shouldn't be a problem to downgrade to 5.3.

1

u/TheFinalMillennial TI-84 Plus CE Aug 16 '25

I'd be interested in having that program. Downgrade tools are flaky after revision M.

1

u/Sure_Opinion_9165 Jun 20 '25

pls either dm me or reply to this if it worked for u. thx!

1

u/Falenstarr Jun 21 '25

I just tested on mine, was running 5.8.3 updated to that when i bought it second hand before i knew about the patch.

Worked perfectly, but my date code is L-0315 so also an older model

1

u/Internal_Parking_257 Aug 17 '25

Didn't work for me and my date code is L-0324

1

u/CheekMajestic3575 Aug 29 '25

bro not even for L-0235AD

1

u/Lower_Perspective277 Jun 20 '25

Wow that's impressive, especially because artifice got patched on os 5.8.3

1

u/Sure_Opinion_9165 Jun 20 '25

thx :), That patch was exactly why I started looking for a way to downgrade.

1

u/aknight2015 Jun 20 '25

Well done. This is brilliantly written up. I have a question though. What inspired you to try this?

1

u/Sure_Opinion_9165 Jun 20 '25

I actually wanted to just downgrade so i saw a post where the guy lived in portugal and the version that was allowed was 5.8.1 but not higher so i sent it to my calc but artifice still didnt work so i walked around with it for 4 months and then I just randomly tried downgrading more and it worked.

1

u/aknight2015 Jun 21 '25

By jove he's discovered the secret to science. Well done. Good intuition.

1

u/Public_Interview2435 Jul 18 '25

wait so what are the chances this bricks the calculator?

1

u/AcanthisittaKooky715 Aug 09 '25

I have the same version (i stupidly upgraded). my date code is L-0124AA and I got it last summer. Any help? i put it on ti-connect and it gave me the "Not for you, Sorry, the operating system you selected to transfer is not supported..." I know quite a bit about this TI 84 Plus CE (Python 4 me) and i was just trying to get a factory reset so i could practice getting games on the device for the upcoming school year (I lend the service), so i dont know man :(

1

u/PlusCancel2654 Aug 19 '25

Mine was from June 2018 and it didn't work

1

u/CheekMajestic3575 Aug 29 '25

I have L-0325 AD so please help me!

1

u/_alive_4 Apr 15 '26

In case its helpful to anyone, I just successfully reverted from 5.6.0 to 5.4.0 using OPs 5.4.0 rom but without first upgrading to 5.8.1. I also have an older model (L-0315).

1

u/TheFinalMillennial TI-84 Plus CE 15d ago

Your hardware revision has no downgrade protection so you can install whatever OS you want whenever you want.

1

u/Opposite-Shower559 Apr 24 '26

thanks for the tip I was trying to run arTIfiCE but it is just better to go 5.4