I can't find the specs on the 3932, so I'm assuming it's basically an Express+ 3931. Roku does that sometimes with models for a specific reseller.
You wouldn't have been able to stop the update, as it would have happened automatically overnight if you hadn't done a manual update. Now, why has the screen display gone screwy on you? No way of knowing for sure, but let's see if we can get you working again.
First, do you see the Roku dancing logo when it's first powered up? Do you have a different TV you can connect it to and see if it works on that set? Can you try it in a different HDMI port in your TV? Do you have a different HDMI cable you can try?
If you want to attempt a factory reset, you must hold the recessed button for a minimum of 30 seconds, regardless of what you see on the screen. 29 seconds isn't long enough.
Dan
Roku Community Streaming Expert
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