arming disabled flag due to BST


When I try to arm the Copter it has a arming disabled flag 16 which is BST, please help me how to fix this error.

Sometimes the copter gets armed and immediately disarms, connecting to betaflight or cleanflight the error is BST arming diabled

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Hello Anthony, Thanks for your quick reply.
Yes I have a QQ190RTF, I actually cannot connect it with TBS Agent also cant upgrade. I can only connect it cleanflight and it usues at the Moment cleanflight 2.3. I am using my X4R frysky and taranis X9+. I already gave proper Serial port and Sbus, I have a working Receiver but Problem is I am getting also 1 I2C error, dont know which one is causing it. Thanks again for your help

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