On the flip side we find some more HiSilicon and some mystery chips:

HiSilicon Hi6421 and Hi6423 Power management IC (as seen in the Mate 20x)

HiSilicon Hi6D05 Power Amplifier Module

6S03V100 2029S13 0022

438 AkLNA 120514

6H12 V1GP1 63024/V1HP510025

Most of the connectors are soldered onto the motherboard as the second layers only reveal contact points underneath.

If you know more, feel free to to help us out and leave a comment.