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To try a reference implementation on an XO laptop, download one of the prebuilt images and proceed with the  instructions below to flash it. Note that images were built using a recent development version of the software. So, images might be used to easily test recent changes.
 
To try a reference implementation on an XO laptop, download one of the prebuilt images and proceed with the  instructions below to flash it. Note that images were built using a recent development version of the software. So, images might be used to easily test recent changes.
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Reference XO images might not be up-to-date (since there are not intended to be used as-is by deployments), so, run full system update right after flashing to make sure that system is recent:
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sudo yum update
    
=== XO-1 ===
 
=== XO-1 ===
    
* 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 [http://download.sugarlabs.org/platform/reference-xo/xo1/os.img os.img] and [http://download.sugarlabs.org/platform/reference-xo/xo1/os.crc os.crc] files to the root directory of a USB stick or SD card.
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* Download [http://download.sugarlabs.org/images/reference-xo/xo1/os.img os.img] and [http://download.sugarlabs.org/images/reference-xo/xo1/os.crc os.crc] files to the root directory of a USB stick or SD card.
* Drop to the [[OLPC:Open Firmware|Open Firmware]] "'''ok'''" prompt by pressing [[File:Esc.svg|24px]] (Esc) repeatedly during boot.
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* Drop to the Open Firmware [[OLPC:Ok|"'''ok'''"]] prompt by pressing [[File:Esc.svg|24px]] (Esc) repeatedly during boot.
 
* Type the command: <code>'''copy-nand u:\os.img'''</code> for a USB stick or <code>'''copy-nand sd:\os.img'''</code> for a SD card followed by [[File:Key_enter.jpg|50px]] (enter).
 
* Type the command: <code>'''copy-nand u:\os.img'''</code> for a USB stick or <code>'''copy-nand sd:\os.img'''</code> for a SD card followed by [[File:Key_enter.jpg|50px]] (enter).
 
* Wait for the display to fill in with color and the "'''ok'''" prompt to return
 
* Wait for the display to fill in with color and the "'''ok'''" prompt to return
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* 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 [http://download.sugarlabs.org/platform/reference-xo/xo1.5/os.zd os.zd] to the root directory of a USB stick
 
* Download [http://download.sugarlabs.org/platform/reference-xo/xo1.5/os.zd os.zd] to the root directory of a USB stick
* Drop to the [[OLPC:Open Firmware|Open Firmware]] "'''ok'''" prompt by pressing [[File:Esc.svg|24px]] (Esc) repeatedly during boot
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* Drop to the Open Firmware [[OLPC:Ok|"'''ok'''"]] prompt by pressing [[File:Esc.svg|24px]] (Esc) repeatedly during boot
 
* Type the command: <code>'''fs-update u:\os.zd'''</code> followed by [[File:Key_enter.jpg|50px]] (enter)
 
* Type the command: <code>'''fs-update u:\os.zd'''</code> followed by [[File:Key_enter.jpg|50px]] (enter)
 
* Wait for the display to fill in with color and the "'''ok'''" prompt to return
 
* Wait for the display to fill in with color and the "'''ok'''" prompt to return

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