I have the same problem. Is there a solution?
Zeke2019
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The problem steps：
The mobile phone system is IOS13.4.1 or above.
In normal mode, bluetooth peripherals are paired with mobile phones to communicate
Send DFU instructions in normal mode
The Bluetooth device enters DFU mode and the Bluetooth is disconnected
The connection failure will be prompted if the bluetooth peripheral is connected to the DFU mode of the mobile phone: Peer removed pairing information
That's the problem at the moment. This situation can cause the device to be in DFU state and cannot be upgraded