CC2652P: fail to flash ZNP FW

Part Number: CC2652P
Other Parts Discussed in Thread: Z-STACK,

Issue:fail to flash ZNP FW.

SDK: CC13x2 / 26x2 SDK Z-Stack 5.20.00

Demo:ZNP

Chip:CC2652P1F

I use the ZNP demo on CC2652P1F.1.8v power supply. Demo did not make any changes.After flash with JTAG once, it can’t be flashed anymore.

The level of TMS and TCK has become about 0.4v, JTAG can not find the chip.Reset pin is OK.

But I use 1352p-2 lanchpad to flash the same firmware and there is no problem.

Do you have any suggestion?