Guys, I lost Ndless support some days ago and I was on 3.9.1.38 OS version on my nspire CX CAS, so this evening I installed DowngradeFix 3.9 'downgradefix391cx.tns' as advised but then TI-Nspire Computer Link Software version 3.9.0.455 didn't let me installing OS 3.6.0.550.
So I first tried to perform a 'reset' and go back to step 3, but only the same : then I went to maintenance menu and deleted OS and documents using '4' and then '1' button.
The problem is that pc software doesn't recognize yet the 3.6 OS file to send to the TI, I've tried also entering into Diagnostics menu and selecting '0. Additional function' -> 'Go to OS mode' and performing a reset but still nothing.
 I'm using the original cable included into the box on a laptop with Windows 7 64 bit, my hardware revision is P-0612E as shown there (from what I had read would be compatible with downgrading)
And the maintenance menu shows'Operating System not found. Install OS now.' like into the image
How can I force Computer Link into installing an OS version that I want to select manually, and not the last 4.X available?
Please help me, I need txt and pdf support (apart from the overclock) and I don't want a milestone on my desk