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nRF52811 custom board will not program

Hi all 

Have been using the nRF52810 for a while now in production with no issues. We are developing a companion product that uses the nRF52811 and we cannot get the custom hardware to program. 

Schematic: 

If I connect to the board with nrfConnect, it detects the device but does not ever read the memory, which means I can never get it to actually write a hex file:

When trying to debug the project in Segger, it always freezes at 55.5% then throws an error. 

Have tried several boards with the same result, and have used both the nRF52840 DK and the nRF52 DK, same result. 

Under pressure to get this PoC going, please help! 

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