4/28/2024 0 Comments Ti nspire cx 4.4 CAS os downloadThe second public key is followed by 02 9E 01 00, which is also found in first four bytes of manifest.sig, followed by (likely) a signed RSA message, being finally followed by FF F0 before reaching EOF.Īll hex values in code-like stylization are unknown what their purposes are for and I've been struggling to find any form of documentation about them, even unofficial. These keys are DER-encoded, which is as simple as base64 encoding them and adding start and end of RSA key headers to the base64. Ive downloaded version 4.4 from TI page, from here, Ive also downloaded older versions newer than mine (4.2.0.293) and no luck. Then, at 0x0126 until 0x0233, the second public RSA key is found. Yesterday I wanted to update my Nspire CX CAS to 4.4, but I couldnt because student software gives 'OS file is invalid or corrupt' with all the OS files Ive downloaded. It is preceded and followed by four bytes, which are 02 AE 01 0E. In manifest.cer at 0x14 until 0x0121, the first public RSA key is found. Not sure if this adds anything to your findings, but I thought I'd share it anyway. I found two public keys in manifest.cer (which, by the way, remains the exact same between 5.3.0.564 and 5.4.0.259, perhaps even before then), which are: Public Key 1 Public Key 2 I also included other things about the key, if it helps any. This makes sense as when I open it is 7-zip some of the files are missing and the other ones show that they have been edited (although I think I have figured out the crc records) and like LambdaLaboratories said distruibution TI software (without permition and we all though thats not happening) is illegal so if you want more "Information" I will post it on the chat room on my website (It does not liik the best but I can promise the security is pretty good (it has had some "real world" testing but thats another story) anyway im rambling, but I will post some things on there (room name: ndless) showing what I have done so maby some other poeple could look at what I have done and contruibute to this.Ĭould you elaborate how you got the keys from the file? i had no succes opening it in any way The software still accepts (or thinks) thats its the newest version but stops and says the file is corrupt. The most recent thing I have done with it is replace the OS and certifactes entirely only editing the os version info from the manifest.txt file. Sorry, I have not made much progress lately I have a large project in school this month so will likely not make much more progress until december.
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