The adapter source code can be downloaded from the link below. It is in the form of an Arduino INO file and is meant to be compiled and programmed from the Arduino IDE.
The "Blue Pill" programming was done using an STLink programmer from AliExpress. The programmer is inexpensive and works quite well.
To get around the voltage regulator occupying the programmer port, a breakout link was inserted when programming was required.
Below are the programmer settings used.
Once the adapter is programmed and properly connected to the Z1 and Surenoo display, it should be good to go.