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Here is the demonstration executed during the RMLL 2011 for the presentation “Libérez vos NAS avec lacie-nas.org”.
The objective is to fully replace the embedded LaCie firmware with mainline free software. The only constraint is to keep the product warranty. Then, the case cannot be opened. It means that the serial and JTAG interfaces cannot be used.
See the section: Install from a LaCie stock U-Boot.