Problem:
I’m having issue with BMW BDC3 cloning using Keydiy KD-X4 programmer, software is up to date , works on pc software but not iPhone.
Solution:
It is ios issue not your device.
That error comes when data package not syncing correctly on iphone.
Try delete app and reinstall then download data again.
Also check version because ios usually behind android updates.
If still same use android for bdc3 it works more stable.
iPhone doesn’t get update till way later try on android will work.