Can this work: FireTV Cube 3rd Gen LLDV/HDR + EZCOO + UGREEN 25173 + PI 3B Plus (USB2)?

[danielbrunt57]

I had previously been using a MS2130 with my old TELUS Optik TV box but I now have a FireTV Cube 3rd Gen with Dolby Vision. I couldn't get my old setup working with the Cube so picked up a UGREEN 25173 but I can't get that working reliably either. Its main issue is frequent reconnection of Dolby Vision on my TV as well as eventual loss of video capture in HyperHDR and a "pink" screen.

Can this combo of hardware work and still let me have 2160p HDR / Dolby Vision on my LG UJ7700?
If so, what's the magic combination of settings?
Or do I need to upgrade to a Pi 4/5 so the UGREEN can utilize USB3?

[danielbrunt57]

My EZCOO was purchased Sept 28/21 and doesn't have a model number on it:

[danielbrunt57]

I found my receipt and it says "SP12H2". I flashed it with xnappo's EZ-SP12H2_ML_332_XNAPPODV and seem to have solved my issue.