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CC2640 On Chip OAD - Bricked Chip when booting to Image B

We are currently trying to implement OAD on Chip functionality

We can build and flash the example files for BIM, Stack and Image A. Image A is booted successfully.

The problem starts when we download Image B over the BLE Device Monitor.

CRC Check of the Image B is ok and the device resets to BIM. The Boot Image Manager Jumps in Image B and tries to boot and jumps in dissassembly view of IAR to the Address 0x710a and cycles after that in 0x7112.

We found out it is the exception handler function, so we are assuming that an error occurred during initialization of the bios of Image B. Is there a possibility to get insight into the TI-RTOS Bios?

PS: we already tried diffrent Image B files and swapping image A and B with customization.