This udev rule worked out just fine:
rephlex@hera:~$ cat /etc/udev/rules.d/45-stdfu-permissions.rules
# DFU (Internal bootloader for STM32 MCUs)ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="ea60", MODE="0664", GROUP="plugdev"
Everytime you plug the Eachine in, be sure to
sudo chmod 777 /dev/ttyUSB0
in order to get permission to the serial/USB port as regular user.
Now just run the Betaflight Configurator using the Chrome app, set the device node, and you're ready to flash and configure Betaflight.
Note, for flashing i had to set the baud rate to 19200 or so, for config it's the 100.000 rate. Just try them all, one of the baud rates will work.
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