Ultras use a PW-11 power supply, outputting 12vdc @ 1.5 v. As far as I know, Ultras are not equipped to be powered over USB, but only through their barrel connectors as are on the PW-11 (could be wrong).
PW-11 replacement from Roku: https://www.roku.com/products/accessories/roku-power-adaptor-ultra
Third party replacement on Amazon: https://www.amazon.com/Listed-Adapter-Roku-Ultra-Streaming-PA-1120-42RU/dp/B07G24S6GY
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
