Acer Aspire TC-780 HDMI port type? Can it do 4k@60Hz?

I have a TC-780-AMZKi5 (Part Number DT.B89AA.008) and it includes an Intel i5-7400 with HD 630 graphics. As I understand, Kaby Lake iGPUs (HD 620+) can all do 4k@60Hz, but only if either the HDMI port is at least version 2.0 (not 1.4), or a DisplayPort-to-HDMI converter is used (not applicable since there's no DisplayPort port).

I don't see anything specific on Acer's product page about there being an HDMI 2.0 port, but Acer's "Windows Mixed Reality Headset System Compatibility List" page lists the Aspire TC-780 under the Ultra support (which needs HDMI 2.0 at a minimum); but if I recall correctly, there's apparently other TC-780 models with different GPUs?

I'm on Windows 10 (1803) with the newest Intel graphics drivers available (tried both 24.20.100.6136 and 24.20.100.6137) and can only do 4k@30Hz at a maximum (60Hz isn't available with any resolutions past 1080p). I'm not sure if the HDMI port on the motherboard is 1.4, or if there's some issue with either Windows 10 or the display drivers. Linux (Lubuntu 18.04 LiveUSB) is the same situation (only 4k@30Hz; 60Hz at 1080p max).

Can someone tell me what kind of HDMI port the TC-780-AMZKi5 has?