One other minor issue I forgot to mention and is very noticeably fixed by the NVIDIA Shield Pro is jerkiness after skipping back and starting playback. On the Fire TV Stick this was reliably bad. It would play too fast, then slow to normal speed. This did not happen on the PBS app, for instance. Video skip and playback with the Shield and Channels is smooth and what I would expect.
As far as updates on FireTV are concerned, I remember out of memory errors and I could not update until I removed a bunch of apps. I only installed PBS, Youtube and Channels (I had removed HDHR earlier). When doing an update of Channels I would have to remove Youtube and PBS, and then do a reset (not a factory one) or the update would not go. FireTV firmware updates are automatic. I have not yet had an update with the Shield.
My display is a 4K Wireless Projector, if that has to do with the ghost frames. I have a UHD Blu Ray player and a Linux PC (MythTV) and no ghosts with either of them on the projector nor Youtube nor PBS app on the Fire TV Stick.
I tried the Shield AI 4K enhancement mode and watched an old documentary, "Ghost Army", which I had recorded recently with ATSC 3.0, 1080P, and I thought the picture was amazing, navigation was fabulous. And ironically there were no ghosts.
My current equipment related to Channels viewing:
NVIDIA Shield Pro on Ethernet
Yamaha RX-A2A
Epson 5040UBe
HDHR Flex 4K (Ethernet only)
Linux PC serving as Channels DVR connected via Ethernet
HDMI Connection:
Shield to Epson receiver using HDMI (receiver has four HDMI inputs)
HDMI Audio output from the Epson receiver to the Yamaha
HDMI wireless link from Epson receiver to the projector
Alternative HDMI Connections:
Shield to Epson receiver using HDMI
HDMI from Epson receiver to TV
HDMI Audio/video from Epson Receiver to my TV
HDMI audio link from TV to Yamaha using eARC
I did a factory reset of the Fire TV Stick, and donated it to my ex-wife after warning her.
My recommendations:
No to Windows (maybe an expert could set this up?)
No to HDHR Android app due to faulty audio
Fabulous experience so far:
Nvidia Shield Pro
Channels App on Shield
Bad experience:
Occasional ghost or stuck frames with Channels and HDHR app used with Fire TV Stick 4K, circa Nov 2023.