Unknown device error 9 in nrf programmer

Question

Hi, 
 
 We designed our custom board using nrf54l05, and tried to flash it using segger J-lInk as well as using nrf54L15-DK Debuger out port using nrf connect Programmer utility. we checked and verified connections which are OK, but facing issue of error code 9, UNKNOWN Device. 
 
 Please Help 
 
 Regards 
 Khodidas

Jared · Accepted Answer

Hi Khodidas, 
 Thanks for the log. I've shared it with our developers and the error in the latest log is not the same as the one you've shared here 
 Khodidas11 said: We tried response is as attached 
 
 The error in the picture comes from the J-Link sw when we try to use J-link to connect to the chip. 
 The error in the log indicates that the debug port is unavailable, which should normally work with a functional device. 
 Question from our developers: 
 
 Did you change anything about your setup between the two tries? Does it consistently error out with the second error or sometimes with the first? 
 
 Both errors indicate that something might be wrong with the hw. 
 Can you measure and report the following voltages, measure as close to the pad as possible, what voltage do you measure?: 
 
 VDD 
 RESET 
 
 Can you also share the schematics and layout files for your custom board? 
 Can you also specify how many boards you see this issue on, is it more than one? 
 best regards 
 Jared

Jared · Answer

Hi, 
 You can upload the files here, use insert->Image/video/file or drag drop the zip containing the files into the reply box. 
 That makes it easier for other engineers to follow up on this case if it becomes necessary later. 
 best regards 
 Jared

Unknown device error 9 in nrf programmer

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