This tutorial is for a different tablet, I will just replace the firmware.
This will also work in ZH&K Sapphire.
You can fix the following issue:
- Forced Closing Apps
- Hang in Logo
This firmware is for BOARD ID T736 V2.3. This tablet usually have a A23 cpu or chip. Already tried this firmware and it is working well. Back Camera, Front Camera, Sensors, Wifi all is working. If something is not working in your tablet then maybe it is not supported in this firmware. So just try another firmware ;)
Phoenixsuit -->Download Phoenixsuit Here
Firmware --> ZH&K Sapphire
For tutorial on how to flash your tablet, when you download phoenixsuit. The tutorial is in there. Credits to AndroidXDA for the tutorial. I can't write a tutorial as of the moment because I do not have a tablet to flash.