Changes

* First, ensure that your laptop is [http://wiki.laptop.org/go/Activation_and_developer_keys unlocked].

* First, ensure that your laptop is [http://wiki.laptop.org/go/Activation_and_developer_keys unlocked].

* Download <tt>osNNNpy.zd</tt> to the root directory of a USB stick

* Download <tt>osNNNpyg.zd</tt> to the root directory of a USB stick

* Drop to the "ok" prompt by pressing ESC repeatedly during boot

* Drop to the "ok" prompt by pressing ESC repeatedly during boot

* Type the command: <code>fs-update u:\osNNNpyg.zd</code> followed by ENTER

* Type the command: <code>fs-update u:\osNNNpyg.zd</code> followed by ENTER