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IWR6843AOP: Using UniFlash tool

Part Number: IWR6843AOP
Other Parts Discussed in Thread: UNIFLASH

Hi,

We created our own board with the IWR6843AOP chip and more or less copied the design from the ISK board.
We connect the the serial cable to U14 and U15 of the IWR6843AOP. We keep  AR_PMIC_CLKOUT_SOP2 high, AR_SUNC_OUT_SOP1 (M3) low and AR_TDO_SOP0 (U10) low.

When starting the UniFlash, we notice pulses on the TX line of the IWR6843AOP and the UniFlash tool will freeze. 
In the Info screen, I see:
--Initialization complete
--Flashing process starting...
--Connecting to COM Port COM3...
--Reset connection to device
--Set break signal

Any hint how to solve this?