parrotgeek1 a écrit:critor a écrit:Non, tu ne peux plus. Du moins pas sans des outils qui existent pour TI-Nspire CX mais n'ont pas encore d'équivalent pour TI-83 Premium CE.
Ce sont les toutes premières TI-83 Premium CE de 2015 qui ont un Boot Code en version 5.0.0 qui se moque complètement de la valeur de version minimale.
This doesn't seem very hard to make. Where is the value stored?
The field 0x037 in the Flash TI-Certificate.
But seeing how TI was extreme this time, if a downgrade tool is released I'm pretty sure an update will then ban asm programs, as they already did with the TI-82 Advanced.
Also, do not reset the value to 0.0.0, just check and reset it to the Boot Code version, thus :
- 5.1.5 if the calculator has Boot Code 5.1.5
- 5.0.0 if the calculator has Boot Code 5.0.0
Why ? Let's assume :
- you've got a calculator with Boot Code 5.1.5
- you reset the minOS value to 5.0.0 or 0.0.0
- you then send any OS older than 5.1.5
- Boot Code 5.1.5 won't find the minOS value in the OS certificate, because it's missing on these old versions, and will flash a random/big minOS value in your Flash certificate
- the calculator now rejects every new OS you try to send to it
- if you don't fix your Flash certificate and if your remove/lose your OS someday, then your calculator is permanently bricked