You can update to 3.1 from every non-TNOCed version 1.4 and above.
But TI support is not known for its accuracy.

Technically, you can directly update to 3.1 if you have boot2 1.4 or later.


Are you using TI-Nspire Computer Link ?

Thanks, I've tried every file from the download links besides non cas or ones with bugs with  and without using tnoc.  I tried it with Cas student software and nspire computer link.  I just got it a few weeks ago with 1.6 on it as a refurb.  I thought about the cx but non color screen  doesn't screen high end calculator.  The reply from ti I just got was too send it in if none of that works.

  Thanks, I appreciate it.  Looks like I'll have to continue this tomorrow.  I just uninstalled the CAS software on here and installed the computer link which gives an error about the connectivity library and won't start.  It works on my girlfriends computer though but I won't see her again until tomorrow afternoon.  It could be because I installed it first before uninstalling the CAS Student Software.

I did some googling and found to install the old version (student cas) then uninstall and type this
msiexec -x {AC59B86B-4E39-47C8-B79A-3EC33B86FB47} then I reinstalled nspire computer link and it worked.
  So looks like I have boot version 1.1 so what should I do?  I tried installing OS 1.1 and it told me it was older then what I had (1.6)  How did it have 1.6 with boot 1.1?

From computer link:
Boot1:1.1.8916
Boot2:1.1.8981

Check TI-Planet.org and see if you can find it - they have most of the common ones and some more uncommon ones.