If you bought/plan on buying AT&T's variant of the Galaxy S4, we have some bad news for those of you who like to flash custom ROMs, kernels, and the like: it's locked down tight.

Historically, Samsung devices – up to and including the SIII – have been bootloader-unlocked on AT&T. The Galaxy S4 brings a major change in that respect, as Steve Kondik (Cyanogen) has confirmed that it is indeed locked, in that it "authenticates the recovery and boot images before executing them."

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