Omnimaga

Calculator Community => TI Calculators => General Calculator Help => Topic started by: alex z on August 20, 2014, 08:19:28 pm

Title: Help With 3.9
Post by: alex z on August 20, 2014, 08:19:28 pm

Hi i'm kind of new to the whole ti-nspire (I used the 84+SE for a few years) and I am wondering is their a possible way to downgrade from OS 3.9 to 3.6?
I have done a fair amount of research but I cant find a way at this point so if their is a possible way to I am willing to try it.
3 cheers for a bad OS!

Title: Re: Help With 3.9
Post by: DJ Omnimaga on August 20, 2014, 08:38:02 pm

Impossible unless you have a TI-Nspire Clickpad or Touchpad model. The color models (TI-Nspire CX and CX CAS) cannot be downgraded in any way for now, even with an RS232 adapter and even if the hardware revision is A through I.

Title: Re: Help With 3.9
Post by: alex z on August 20, 2014, 08:46:36 pm

Well could is is possible to unpack the OS to see its files or no?

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In theory the OS should have a file that tells the software that opens it what version it is and ect... If there is such a file and it could be located in theory you could replace OS 3.6's definition file with OS 3.9's.

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http://hackspire.unsads.com/wiki/index.php/OS_upgrade_files (http://hackspire.unsads.com/wiki/index.php/OS_upgrade_files) this might help (but it is outdated)

Title: Re: Help With 3.9
Post by: Legimet on August 21, 2014, 11:15:56 am

It's RSA-signed so we can't change it unless we have TI's private key.

Title: Re: Help With 3.9
Post by: Vogtinator on August 22, 2014, 07:51:08 am

Quote

The color models (TI-Nspire CX and CX CAS) cannot be downgraded in any way for now, even with an RS232 adapter and even if the hardware revision is A through I.

They can. Install boot2 3.10 and nlaunch, then you can install whatever OS you like to.

Title: Re: Help With 3.9
Post by: DJ Omnimaga on August 22, 2014, 03:16:21 pm

Yeah I saw in another topic when that Chinese guy posted how. I was sure TI had blocked this in 3.9