When uploading via j-link:
esptool.py v2.6
Configuring upload protocol…
AVAILABLE: esp-prog, esptool, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa
CURRENT: upload_protocol = jlink
Uploading .pioenvs\featheresp32\firmware.bin
Open On-Chip Debugger v0.10.0-esp32-20190313 (2019-03-13-09:57)
Licensed under GNU GPL v2
For bug reports, read
OpenOCD: Bug Reporting
adapter speed: 20000 kHz
Info : Configured 2 cores
esp32 interrupt mask on
Warn : Failed to open device: LIBUSB_ERROR_NOT_SUPPORTED.
Error: No J-Link device found.
** OpenOCD init failed **
shutdown command invoked
Warn : Flash driver of esp32.flash does not support free_driver_priv()
Warn : Flash driver of irom does not support free_driver_priv()
Warn : Flash driver of drom does not support free_driver_priv()
*** [upload] Error 1`