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January 5, 2026
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Can't Program or erase NUCLEO-WL55JC1

  • January 5, 2026
  • 1 reply
  • 361 views

I have just received 2 NUCLEO-WL55JC1. Upon connecting either one of them via I see The Red (main power) and green LEDs on. The other thre are flashing alternatively (red, orange, blue). I haven't changed the default jumper settings.
The following debug probes were found:
[0]: STLink V3 -- 0483:3754:0026003A3234510A33353533 (ST-LINK)

12:21:32 : STM32CubeProgrammer API v2.21.0 | Linux-64Bits
12:21:46 : UR connection mode is defined with the SWrst reset mode
12:21:46 : ST-LINK SN : 0026003A3234510A33353533
12:21:46 : ST-LINK FW : V3J16M8
12:21:46 : Board : NUCLEO-WL55JC
12:21:46 : Voltage : 3.24V
12:21:46 : Unable to get core ID
12:21:46 : No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication
12:21:46 : ST-LINK SN : 0026003A3234510A33353533
12:21:46 : ST-LINK FW : V3J16M8
12:21:46 : Board : NUCLEO-WL55JC
12:21:46 : Voltage : 3.23V
12:21:46 : Error: Unable to get core ID
12:21:46 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

Best answer by Imen.D

Hello @mapfumo and welcome to the Community,

To resolve connection errors when connecting and programming the STM32 target board, try the tips described in this articleHow to solve connection errors when connecting and programming the STM32 target board

1 reply

Imen.DBest answer
Technical Moderator
January 5, 2026

Hello @mapfumo and welcome to the Community,

To resolve connection errors when connecting and programming the STM32 target board, try the tips described in this articleHow to solve connection errors when connecting and programming the STM32 target board

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
mapfumoAuthor
Associate
January 5, 2026

Thank you. That worked.