XIAO nRF52840 New units no longer power up from battery pins?

Hi all, I have similar issue with 2 units: Meshcore, Meshtastic will not boot up. What I tried so far:

  • Powering by battery/USB/both
  • Updating bootloader with oltaco version
  • Erasing flash
  • Flashing by uf2 and web flasher via serial

No success so far. I’ll flash Meshtastic and get debug console output next