I am trying to connect ACS880 with Drivetune app on bluetooth. I could connect successfully with only 1 out of 4 drives. Balance 3 drives enters in bluetooth mode and disconnects after waiting for some time. In one off the drive control panel freezes on "Connecting to ACS880" message randomly and unfreeze only after power cycle. I noticed ACS880 bluetooth ver 4.0 is older than 5.0 on my mobile and wonder if that is the reason. Drivetune is good app and quite easy to operate but only if it works. Appreciate any suggestion to fix the issue. Thanks for your time.