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DFU_UPDATE_ERROR

Hello,

I'm working on nrf52832 dfu secure bootloader example.I implemented button less example to update my firmware and it works fine.

Now i switch off the power supply and Switch ON after some time and send a message to enable the DFU bootloader to the DK and  enters in to DFU mode. Now,here i'm getting GATT err(0x85) while updating the firmware. any one please help me to resolve this issue.