Green light seen during flashing.
I followed these instructions from the librem5-flash-image script:
Turn all Hardware-Kill-Switches off
Remove battery
Hold volume-up
Insert the USB-c cable: (red light blinks, no green light)
Reinsert the battery: (red light is constantly on, the script will continue)
This happened in reality (if I remember correctly):
Turn all Hardware-Kill-Switches off
Remove battery
Hold volume-up
Insert the USB-c cable: (red light blinks, no green light, after a while alternating green and yellow light, the script will continue)
Reinsert the battery: (yellow light is constantly on)