I have some strange behaviour of my STLINK V2 when I just plug it in the USB port and then open the STLINK Utility tool. When I then go to settings it finds the STLINK V2, but after about 5s the program seems to hang and the serial number disappears and it says "Old ST-LINK firmware / ST-LINK already used"
I use windows 10 and the most recent drivers for the STLink and the windows 10 drivers (STSW-LINK009). The STLink is just plugged in and the SWD interface is not connected to any device.
Has anyone an idea why this error occurs and how to fix it?
Best Answer
Had a very similar issue with an ST-link that connected to the target device intermittently and then not at all. Ended up being a failed 22R resistor withing the ST-LINK/V2 that goes to the header. I Did a track cut to bypass the faulty resistor part (as it is a multi resistor device) and linked in a new through hole 22R resistor and all is good again. The mentioned resistor RS1 links directly to SWDIO (pin 7) on the header and is just one resistor within the multiple resistor SMT device. You can cut the track linking the resistor RS1 to U7 and the apply the new resistor directly between U7 and the Header. For reference: The resistor in question and the required pin on U7 also links to pin 19 on the IC U2 Anyway the resistor might be worth checking if you have exhausted other options... worked for me, may have been an isolation issue.