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Where exactly is the GETCERT.8xp file?
First, download BrandonW's CertTools and send GETCERT.8xp to your calculator.
I am a proud cynic.
I'll release the source to this and upload it to ticalc.org as soon as I update it again. (The update is already finished.) I just have to wait for a certain real world event to happen before I release it. If you don't know what I'm talking about, don't worry, you will soon.
I also added in an option to view the certificate in Calcsys. Normally this is impossible because the certificate is only visible if flash is unlocked. So I JP'd to Calcsys with the flash unlocked. I'm not really sure this is useful for anything, but it wasn't very difficult. If you use it, just be sure you don't run AboutNam from a shell since it deallocates itself and that will create some problems.
I was wrong about the OS transferablility. You can't send 83+ OS's to the 84+, but aside from ethical reasons, there's no reason you can't put 2.55MP on your 83+.Edit: I'm not sure there's even enough space to do that. Someone needs to try it.
Let's consider OSes 2.30-2.43:Compared the the last TI-83+ OS, there is nothing new (except USB & clock support which are useless on a TI-83+).So installing them is totally useless. You'll get nothing more, and might run into problems.Let's consider OSes 2.53-2.55:There is something new: MathPrint. Those ones are interesting.But they want 48Kb or RAM. So there are instable on basic TI-83+ (RAM chip is only 32Kb).They'll only work on TI-83+SE (RAM chips is 128Kb).