[Q] Can't load into RSD mode

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http://forum.xda-developers.com – So I am running the latest sprint 2.3.5 update for my Motorola Photon. I want to unlock the bootloader so I can flash it. I try to load into RSD mode by holding the UP button and the power button at the same time. But I don't have any luck with that. I also tried that Down button and the power button with no luck. Any ideas? (HowTos)