So i had put a 3.1 update on someone else's Calculator but he somehow screwed around and deleted the OS somehow and now i cant install any os at all saying error installing os (At the end of the installation.) It now just rests on OS not found, install OS now.

Everytime i install 3.1 again it says update succesfully send with the student software and the calculator says error installing OS, and reboots into the error screen again.

Yes, but with the downgrade protection it wouldn't say "update succesfully".



Let's reformat the filesystem.

While holding the reset button, press and hold simultaneously the 3 keys Home Enter EE, and then release the reset button.

You should get the maintenance menu around 60% of the loading bar.
Press 4 to clean the whole filesystem.

Yes, but with the downgrade protection it wouldn't say "update succesfully".



Let's reformat the filesystem.

While holding the reset button, press and hold simultaneously the 3 keys Home Enter EE, and then release the reset button.

You should get the maintenance menu around 60% of the loading bar.
Press 4 to clean the whole filesystem.

The buttons wont work, it just loads and goes to "Operating system not found. Install OS now."

EDIT: Sorry for double post.

Yes sorry, my mistake - it's Doc Enter EE.

I did that reformatted the whole thing and its working now, thank you <3

Also im not sure if this is right french but im gonna say it anyway, Je t'aime!