Suggested fix (for ISTAD connection issues):
Remove all the diagnostics application you already have
on your laptop including Rheingold and BMW tools.
- Click on start 🡆 regedit in the search bar 🡆 access your registry keys editor 🡆 computer HKEY_CURRENT_USER\Software
Under drive C: \organize tab \ folder and search options 🡆 view tab 🡆 select ‘show hidden files’ folder or drives.
Delete anything says BMW under program data folder
-Reboot your machine after deleting
any registry key.
-Re-install ISTAD