I bought this Self Balancing Robot ZYC0049 from Aliexpress about 2 years ago, but the sketch for the Arduino wasn't working! After many attempts and emails from the seller, I gave up and tried again... Even my friend Hari wasn't able to adjust the sketch! I ordered a new Self Balancing Robot ZYC0049 from Aliexpress and it was worse than my first time, because the website didn't work at all! After a week searching on the Internet I was able to get a sketch for this model! I'm gonna give you a place to download these files! Here it is: drive.google.com/drive/folder...
There are many more files there, not just for ZY0049, so scroll down to find it.
These files are for the robot that has the main PCB marked as PBOT-3.0
At this point everything works, but the Bluetooth app, that I can't find!
Also when uploading the Sketch to Arduino, unplug the Bluetooth first!