Meehl Solutions Powder Trickler - Firmware Updater
Flash firmware over USB from your browser
Firmware Update
How it works: This tool uses ESP Web Tools
to flash the selected firmware over USB. When you click Flash Firmware, ESP Web Tools
will attempt to automatically enter bootloader mode and open the installer.
Do not disconnect the USB cable during the update.
If automatic bootloader entry fails, hold BOOT while pressing RESET on the
device before clicking Flash Firmware.