Latest Firmware Upgrade (DFU) for Avantree Bluetooth TV set HT41899 (V1.10)

Disclaimer: Please contact Avantree Support BEFORE upgrading. Be aware that if you upgrade without prior consultation with Avantree technical support and the product dead due to DFU misoperation, the warranty is not covered.

Step 1: Device Firmware Upgrade (DFU) File
Download the DFU file, taking note of where you save it - you'll need it later.

File: HT41899 - DFU to V1.10  (right-click then select 'open in new tab')

Step 2: Enter Audikast Plus transmitter into DFU Mode

Connect the transmitter to a Windows Computer via the USB charging and DATA cable. Power on, PRESS & HOLD BOTH “1“and ”2” Buttons for 15s until BOTH "Bluetooth icon" on the transmitter turn PINK, now transmitter enter DFU mode. 

Step 3: Download & Install CSR Bluesuite to Perform DFU

For Windows PC - Please follow the steps in How to Conduct Firmware Update (DFU).

For Mac Computer - Please follow the steps in How to Conduct Firmware Update (DFU).

Step 4: Repair and LOCK the both headphones to the transmitter.

Once the DFU is completed,  "1" on the transmitter will enter paring mode automatically and Bluetooth icon close to "1" flashes RED and BLUE BLUE quickly. Now REPAIR and LOCK BOTH headphones to the transmitter manually follow the steps in Re-pair, Connect, and Lock the headphone and transmitter base. 

Please feel free to contact support@avantree.com with any further questions about this product or the above DFU procedure.