Thay is also an enigma for me of why vuplus duo2 for instance can not show 4k contents.
Hardware cofiguration is ok. And there seems to be only a software issue involved to be taken care of which they claim is lacking in old models.
This logically should be solved with add on decoder of h265 to be installed to do the job of transcoding.
Because from what I figured new 4k boxes all have similar configurations with those of vuplus duo2. So that doesnt seem to be a hardware issue.
To be pessimistic, I reckon, they want to sell out new 4k box in the market and encorage users to replace the old ones with new 4k ones. Thats why they dont software upgrade the ones which are potential to be upgraded like duo2.
There is no hardware deficncies which block duo2 in running 4k contents except a codec (h256) which has never been released.
DUO2
Broadcom’s BCM7424 is an
HD full-resolution 3DTV Set-top Box System-on-a-Chip solution designed for residential video gateways.
Broadcom’s BCM7424 is a high-definition (HD) full-resolution 3DTV Set-top Box (STB) System-on-a-Chip (SoC) solution designed for residential video gateways. It also features a 1-Gibabit pixel-per-second OpenGL® ES 2.0 3D GPU for advanced 3D graphics acceleration, and whole-home connectivity that includes Digital Living Network Alliance (DLNA®) support and integrated Ethernet MII and PHY support for connectivity with Broadcom's Wi-Fi and powerline solutions. Providing these high levels of integration and performance, the BCM7424 is designed to meet the needs for the next-generation connected home experience, including a compelling and leading video content experience, more Web-based software applications and the ability to stream content and connect devices in the home and on-the-go.
https://www.broadcom.com/products/broadband/set-top-box/bcm7424
To believe that it is VU + problem is ridiculous.
Processor manufacturers not only sell processor hardware but processor software and options.
What you pay you get.
Ask broadcom to send you a free processor update if it is possible ...