Technical Service Bulletin

June 16, 2023 

Michi Bluetooth 5.1 aptX™ HD Module 

The latest Apple iOS version (including OS V15.7.2) may cause the APPLE MUSIC app to stop playing audio when manually jumping between tracks in a playlist.  The Bluetooth connection is maintained but there is no audio output and no playback information (sample frequency and/or bit rate) displayed.  A hard power cycle of the unit remedies this issue. 

Earlier versions of iOS do not appear to have the same issue.  Other iOS Apps (i.e. iTunes, Spotify, Tidal, etc.) are NOT affected by this use case.

If this is reported, please contact Rotel at sales@rotelglobal.com to order a new Bluetooth 5.1 module (Rotel Part Number: 093E-BTM0002-D-3) with updated firmware V1.04 (or newer) that resolves this iOS compatibility issue.  

Note: All new delivered spare parts will be programmed by new firmware V1.04 (or newer) before package and shipment from now on, either of below two methods can help to identify this change.

   

   

Bluetooth module replacement requires removal of the top cover and replacing the Bluetooth module in the socket (no special tools or soldering is required) as shown below.

Affected unit models include: X3, X5, P5, X3 Series 2, X5, Series 2, P5 Series 2

Release Type

X3 Series 2

X5 Series 2

P5 Series 2

● Part Number of New Bluetooth Module 5.1 is 093E-BTM0002-D-3

● New Bluetooth module 5.1 built Qualcomm IC as below photo.

The Instruction use Michi X5 Bluetooth Dongle Replacement as example

b. Remove the Bluetooth 5.1 dongle from the socket. 

c. Prepare the new ordered Bluetooth dongle (with firmware V1.04 or higher installed)

     

d. Install the new Bluetooth 5.1 dongle in the socket. Pay CAREFUL attention to pin alignment to avoid damage to the dongle and the unit.

e. Reassembly the unit and top cover.

f. Test to verify the new Bluetooth module works properly.

 

PDF file download please click below:

Technical Service Bulletin - Michi Bluetooth 5.1 aptX™ HD Module