Official Stock ROM Update & Tutorial for HiPad LTE

The custom ROM/Firmware is terrible. TOO MANY BUGS!
Touch Screen too sensitive - no adjustment SIM failures - SIM 2, 128GB Micro SD/TF card worked at first, then became intermittent, now doesn’t function.
SIM 1, 4G LTE, same thing, still working but has glitches. I’ve re-installed many times.
Incoming calls are fine. Outgoing calls lose audio and disconnects.
Constant Google/Chrome error message - “Your device does not support Google Play Services contact your manufacture”…Can’t download anything from Play Store!