The CM update guide doesn't say to change your bootloader, all you do is put the disable lagfix file, flash overstock and then flash CM7.
What's the perk and what is supposed to happen if you don't have a GB bootloader and run a GB rom?
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Google Galaxy Nexus, Stock 4.2.2, CWM6 Touch
Samsung Vibrant, CyanogenMod 10
HP TouchPad, CyanogenMod 10
LG Optimus T (retired), CyanogenMod 7