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I would highly suggest to check the signal integrity of your setup and the related cables. Sometimes lowering the target interface speed does also help. => I have checked again. The situation is the same as before. 1. I try to use an oscilloscope to measure the waveform. When I put the oscilloscope on the clk, I can download the FW normally. The input capacitance of the oscilloscope is 3.9pF. 2. Base on list 1, I put 3.9pf on GND and close to the receiver side. It works fine.I don't know why 3.9…

Hi, I try to download FW to my device via J-link. I use SWD interface. Sometimes I can not connect to target, but device can be selected. The log message is as follows Sometimes I can work well. It’s not stable. Let me describe the connection environment PC ⇒ J-link ⇒ wire (Dupont Line) ⇒ transfer board ⇒ wire (Dupont Line) ⇒ device Total length is about 60cm On the device side, the SWD path (swdio, swclk, gnd) are directly connect to the MCU. I don’t put series resistor or pull up/pull down res…