To access microSD card from your Rover, open the main electronics box (4x cross-headed screws) and extract the card from white-tape SD-slot extension slot located on top of the electronics.
Looking at the inside of the electronics box cover, you'll see a microSD-to-SD card adapter secured in a slot. Take it.
Put the microSD card in the adapter and then connect it to your computer.
You can download our stable production image from here
Alternatively, you can check GitHub releases for newest development images.
Open Etcher and point it to your new SD card image location via 'select image' (.img or .zip file). Then your card should be pre-selected in 'select drive' option. And 'Flash!'.
After the flashing completes, disconnect the card and put it back into the Rover.
You can use
dd tools to copy image from .zip file into microSD card like this:
unzip -p [ZIP_FILE] | sudo dd of=[SD_CARD_DEVICE] bs=4M status=progress
unzip -p TurtleOS-1.2.0-20181221.zip | sudo dd of=/dev/mmcblk0 bs=4M status=progress
You can fix this: