R6T3
From Free60 Project
R6T3 is the label of a resistor on the mainboard of the Xbox 360. It supplies the necessary voltage for the Xenon CPU to burn the so-called e-fuses. Burned e-fuses prevent older firmwares (currently any older rev. than 4552) from running on your Xbox 360, thus eliminating the possibility to downgrade to an earlier version of the kernel. The Resistor itself is located in the field T-6.
High Resolution Image (http://www.360mods.net/modules/coppermine/albums/userpics/efuse/r6t3.jpg)
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