Hello,
My STWINKT1B (STEVAL-STWINKT1B) had been working fine, but suddenly it is no longer detected by PySDK.
Now the red LED blinks rapidly (≈4 Hz) and no USB/COM device appears in Windows Device Manager.
To recover it, I performed a full flash using STM32CubeProgrammer + ST-LINK (SWD), with the official firmware:
C:\Users\User\Downloads\fp-sns-datalog2\STM32CubeFunctionPack_DATALOG2_V3.1.0\
Projects\STM32U585AI-STWIN.box\Applications\DATALOG2\Binary\datalog2_release.binFull erase → Program + Verify = OK, but after reset the symptom remains: fast red LED blinking and still no USB device.
During the firmware update, both the ST-LINK and the board were connected to my laptop.
I also powered the board via micro-USB for more than 2 hours, but the red LED keeps blinking at the same rate (no green LED).
I tried different cables/ports/PCs, battery OFF/ON, and a FAT32/MBR microSD (also tried empty card), but the issue persists.
Could you clarify:
What does the fast-blinking red LED (~4 Hz) indicate on STWINKT1B with DATALOG2?
Can keeping ST-LINK attached cause the MCU to stay halted or block normal USB/CDC enumeration?
What Option Bytes (BOOT settings, RDP, BOOT_ADD0) are required for normal flash boot on this board?
Any recommended recovery procedure (e.g., disconnect ST-LINK, power via USB OTG only, required SD card format/content) to get PySDK detection back?
Environment / Facts
Board: STWINKT1B (STEVAL-STWINKT1B)
Firmware: FP-SNS-DATALOG2 v3.1.0 (datalog2_release.bin)
Tool: STM32CubeProgrammer + ST-LINK (SWD)
Symptom: Red LED fast blink (~4 Hz); no USB/COM device
Tried: Reflash, different PCs/cables, battery OFF/ON, microSD FAT32/MBR (empty), long USB power/charge
