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For the relocking, all you have to do is put the relock RAPHIMG.nbh file into the root of your Storage Card, then restart your phone in bootloader mode (hold down power and volume down buttons, and keep holding while you hit the reset pin. wait until you see the tricolour, then let go of the power/vol-down buttons). Follow the instructions in the grey background / blue text prompts, and you'll flash back to the stock SPL.