Q：Which device can be used with hd41 pro?
A: HD41 can Works perfectly with HDMI devices like 4K TV, projector, HDMI LCD, TV box, Blu-ray player, DVD player, PC,STB, XBox One, PS4 etc.
Q: what the function of hd41 pro?
A: HD41 PRO supports Supports PCM, Dolby True HD, DTS-HD Master Audio up to 7.1CH. Digital and analog Audio output, Supports up to 4K@60Hz( (4:4:4) for crisp, clean and powerful display(RGB and 3D features are also supported), supports ARC18Gbps HDR Optical Out HDCP2.2 ARC 18Gbps HDR Optical Out and HDMI2.0b Auto Switch.
Q: Does HD41 PRO has how many interface in and how many output?
A: HD41 PRO has 4 ports in and 1 port output.
Q: Does HD41 PRO supports Audio up to 7.1CH?
A: Of course, it supports
Q: How to upgrade the HD41 PRO?
A: HD41 PRO Update
Here is the user Manual of how to updrade the HD41 PRO:
Notice: if your HD41 PRO is Version: 8.3, you do not need to update it. This version is the newest version.