raspberryPi


Safe Mode
=Insert a physical jumper between pins 5 & 6 of GPIO header P1.  -OR-
=Append rescueshell to the argument list in the recovery.cmdline file which is found in the root NOOBS directory.
=boot into a basic busybox shell rather than launching the NOOBS GUI
[Disable GPIO false trigger]
-append disablesafemode to the argument list in the recovery.cmdline file which is found in the root NOOBS directory.

Recovery Mode
=Try pressing shift only when the grey splashscreen is displayed rather than holding it from boot up.
=Append gpiotriggerenable to the argument list in the recovery.cmdline file + connect GPIO pin 3 on header P1 to GND (pin 25).
=lets you enter the NOOBS interface to do the following:
 > Install selected operating systems onto your SD card.
 > Edit configuration files for an operating system.
 > Select the display language, keyboard layout, display mode (HDMI, composite etc.).
 > Exit NOOBS and reboot the Pi into the operating system boot menu.

Recovery Mode (Force entered, overrides GPIO or keyboard input)
=Append forcetrigger to the argument list in the recovery.cmdline file
=the Recovery Mode will be displayed every time you boot from your NOOBS card (until you edit recovery.cmdline again).

Raspberry Pi 3B+
= pin RUN (for CPU only) -> pull down GND ; RESET buttom
= pin PEN (board level ) -> pull down GND ; normal shutdown, go sleep

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