HDMI1.4 does not have enough bandwidth to put 3840×2160 at 60Hz thru.
A resolution of 3840×2160 at 30Hz is max.
You would need a DisplayPort1.2- or a HDMI2.0- or USB3.1 Type C output on the notebook to make that possible.
Apart form that i don’t think Intel Integrated Graphics HD4400 is capable of generating 3840×2160 at 60Hz.
Beautiful notebook (wish i had one) but not to power a 4K screen at 60Hz.