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+Safe mode and factory reset
+===========================
+
+If something goes wrong with your pyboard, don't panic!  It is almost
+impossible for you to break the pyboard by programming the wrong thing.
+
+The first thing to try is to enter safe mode: this temporarily skips
+execution of ``boot.py`` and ``main.py`` and gives default USB settings.
+
+If you have problems with the filesystem you can do a factory reset,
+which restores the filesystem to its original state.
+
+Safe mode
+---------
+
+To enter safe mode, do the following steps:
+
+1. Connect the pyboard to USB so it powers up.
+2. Hold down the USR switch.
+3. While still holding down USR, press and release the RST switch.
+4. The LEDs will then cycle green to orange to green+orange and back again.
+5. Keep holding down USR until *only the orange LED is lit*, and then let
+   go of the USR switch.
+6. The orange LED should flash quickly 4 times, and then turn off.  
+7. You are now in safe mode.
+
+In safe mode, the ``boot.py`` and ``main.py`` files are not executed, and so
+the pyboard boots up with default settings.  This means you now have access
+to the filesystem (the USB drive should appear), and you can edit ``boot.py``
+and ``main.py`` to fix any problems.
+
+Entering safe mode is temporary, and does not make any changes to the
+files on the pyboard.
+
+Factory reset the filesystem
+----------------------------
+
+If you pyboard's filesystem gets corrupted (for example, you forgot to
+eject/unmount it), or you have some code in ``boot.py`` or ``main.py`` which
+you can't escape from, then you can reset the filesystem.
+
+Resetting the filesystem deletes all files on the internal pyboard storage
+(not the SD card), and restores the files ``boot.py``, ``main.py``, ``README.txt``
+and ``pybcdc.inf`` back to their original state.
+
+To do a factory reset of the filesystem you follow a similar procedure as
+you did to enter safe mode, but release USR on green+orange:
+
+1. Connect the pyboard to USB so it powers up.
+2. Hold down the USR switch.
+3. While still holding down USR, press and release the RST switch.
+4. The LEDs will then cycle green to orange to green+orange and back again.
+5. Keep holding down USR until *both the green and orange LEDs are lit*, and
+   then let go of the USR switch.
+6. The green and orange LEDs should flash quickly 4 times.
+7. The red LED will turn on (so red, green and orange are now on).
+8. The pyboard is now resetting the filesystem (this takes a few seconds).
+9. The LEDs all turn off.
+10. You now have a reset filesystem, and are in safe mode.
+11. Press and release the RST switch to boot normally.