Hello. I'm having the same issue with a too current Firmeware version on the Pionner BDR-S13U-X, I have Revision 1.04 from 12-12-2022. I bought the drive from Amazon a few months ago because it was the "best" according to many reviews, but now I'm seeing the huge limitation with UHD 4k movies. Any fix in sight yet? Thank you!
Nah sorry man if you can return it.
I have those with old fw if you want one.
See below
Thank you for replying. I'm hopeful there is a fix at some point. By the time I posted initially, I was past the Amazon return window, so I'm stuck with the drive.