Is there any working cfg for stm32L0 ???
I did a couple things to get debug on a Discovery L4 board working from a Windows 10 platform:
1. Update Windows USB drivers using Zadig
2. Update the ST-Link firmware
It sounds like you've already updated the ST-Link firmware, but the Zadig drivers might be worth a try. I'm not all that knowledeable in the area, but as I understand it openocd depends on lib_usb in Newlib ..... and the Zadig drivers add support for this to WIndows. I found some directions to do this online and it worked for me.
I'm also using STM32CubeMX to generate all the setup for my project, then importing it as described in the OpenSTM32 pages. I note the debug configuration for this is for the imported project, and I followed the procedure to set "Manual spec" and choosing Debug Device: ST-LinkV2-1 and Debug interface: SWD.