You can encrypt the flash content, which puts you down to memory, something that is pretty hard to do when it's embedded inside the CPU SoC. If the baseband & o

You can encrypt the flash content, which puts you down to memory, something that is pretty hard to do when it's embedded inside the CPU SoC. If the baseband & other co-processors are not trusted with full DMA access to the CPU ram, then it's practically impossible.