Reflashing using a serial connection

This method is the most widely used since it only requires a working serial port. It is slow, but reliable.
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Reflashing using a serial connection and an MMC/SD/microSD card

For those who have an expansion card or motherboard with MMC/SD/microSD support, this method of reflashing can save substantial time over downloading images over a serial connection.
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Reflashing using a serial connection and a CF card

The process for reflashing using a CF card is quite similar to MMC/SD/microSD procedure.
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Reflashing from a linux login session

All of the above methods relied on using a serial connection and U-boot in order to reflash your root file system and linux kernel. It is also possible to reflash your root file system from within linux using the mdt-utils package.
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