GOS21606 I can not send any command like: ADB reboot recovery
and you don't need to. This part is only for the users who have USB debugging enabled. For everyone else, you can get there as per the guide:
by selecting the "Recovery" option in the bootloader interface
after that you follow the instructions:
You should see the green Android lying on its back being repaired, with the text "No command" meaning that no command has been passed to recovery.
Next, access the recovery menu by holding down the power button and pressing the volume up button a single time. This key combination toggles between the GUI and text-based mode with the menu and log output.
Finally, select the "Apply update from ADB" option in the recovery menu and sideload the update with adb. For example:
`adb sideload raven-ota_update-2021122018.zip``
and that's it. That's the official, recommended way. This works without developer options enabled at all.
userofgos Change your USB-C port settings to "Charging-only when locked, except before first unlock"
Sorry, but what has any of that to do with sideloading? GrapheneOS doesn't influence how fastboot works. The USB-limitations are OS-level, not firmware-level.
Edit: it was literally the next sentence in the guide lol
Our USB-C port and pogo pins setting protects against attacks through USB-C or pogo pins while the OS is booted.