I like how everyone is assuming these are issues thanks to some bullshit anecdotal evidence.
My Sony provided cable worked fine, and I downloaded the update just fine. Wanna know why? I plugged it in gently, and I waited PATIENTLY for the system to download, reboot, install, etc.
Oh stop it .. can't fault anyone here getting a brand spanking new PS4 for being extremely careful, cautious, and prepared.
Yes, I will plug in carefully and wait patiently ..