Latest Firmware Upgrade (DFU) for Avantree Bluetooth Transmitter Oasis Basis (TC500-D)(V1.88)

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

Please download the upgrade firmware file to your computer noting the save path. Please note you can not open this file directly, just to save and choose when you upgrade.

File: TC500B DFU V1.18

Step 2: Enter Oaisis Basis into DFU Mode

Connect Avantree Oasis basic to PC via a Micro USB sync & charge cable. (The usb cable coming with Oasis Basis is just for charging). 

Slide the Power/Mode switch to "Bluetooth" to power on, press both and the volume "+" for 10S until all LED indicators are off.

Step 3: Download & Install CSR Bluesuite to Perform DFU

For Windows PC - Please follow the steps in Step-by-Step Bluetooth Device Firmware Update (DFU) Guide with Windows PC

For Mac Computer - Please follow the steps in Step-by-Step Device Firmware Update (DFU) Guide for macOS

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