ADC reading on E73-2G4M04S1B and nrf52dk

[XlashDev]

I followed this tutorial to read ADC from A0/P0.03.
https://medium.com/home-wireless/reading-analog-data-in-zephyr-with-a-nrf52840-e05dae326b9b

1. This has work before with E73-2G4M04S1B with vbluno52 as selected board but now after getting back to the project after how many months it is not working anymore. Is there any change in API? and it has weird output. I set to 12bits = 4095 max but it shows 65413 on debug prints. That's on both 0v and VDD.

2. With Sandeep arduino based repo.
   https://github.com/sandeepmistry/arduino-nRF5
   I can upload my code to E73-2G4M04S1B using nrf52dk as board with no problem. With zephyr it says here that he just disable the DC DC and I tried commenting it and upload using nrf52dk and my board cant be detected anymore.
   Bluetooth mesh example not working  #25379 (comment)

3. Either i need to make this work with nrf52dk as selected board that will not brick my E73-2G4M04S1B or continue using vbluno52 but need to fix the ADC function.

TIA