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Unknown error code 4000. Cellular update failed. How can this be fixed? I have up to date iTunes. I have backed up my phone. After several attempts, power cycling both laptop and iPhone, and a couple backflips I still haven’t got this resolved.
Try this please --> This user has posted a method through which error 4000 can be resolved.
Try this please --> This user has posted a method through which error 4000 can be resolved.
Unknown error code 4000
