AK not connecting to controller

[admin]

check RS232 cable whether have good contact.
when AK board running, the LED will blink, if not "blink" , you can try to download firmware.
another test way : you can try to connect cable with RS485, not use RS232. then make sure your AK and H32B Pro's RS485 config setting is same.

are you sure it's not the h32b pro firmware? i will test with rs485 too

i don't understand your means, the solution i have said before, you can try.