File name: LGGW-rootboot.img
Now, reboot into the bootloader:
And boot the G Watch using the modified boot image. Warning: Do not flash the boot image, just boot from it!
fastboot boot LGGW-rootboot.img
The watch will play the boot animation for about 2 seconds, then automatically reboot. The modified boot image is only meant to run once so that it can install the necessary superuser binaries. After the watch automatically reboots, it will be running on the stock boot image. There will be no outwardly obvious signs the G Watch has been rooted, but you can check it by opening a shell through adb and running su.
If your prompt turns from shell@dory to root@dory, then you’ve got root on your G Watch. Congratulations!
But until now there isn’t much to do yet, we will have to wait for Superuser Managers like SuperSu or Apps using root access.