I can confirm this fixes a bug in 4.00 that caused my primary ps4 to not recognize itself as my primary ps4. Called Sony repeatedly insisting that it was a bug, they were no help, and insisted my ps4 was hacked or that I was sharing my account. The minute after I installed this update, I attempted to activate my PS4 as primary, it activated instantly. Previously it would tell me that it couldn't activate as my primary ps4 because another system was already registered as my primary. Sony also refused to tell me whether or not my SKU matched the one registered as my primary (which would've confirmed a problem in the PS4's ability to recognize itself as primary, rather than another actual device being the primary)
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Re: PS4 Firmware Update 4.01 Puts in a Surprise Appearance
I can confirm this fixes a bug in 4.00 that caused my primary ps4 to not recognize itself as my primary ps4. Called Sony repeatedly insisting that it was a bug, they were no help, and insisted my ps4 was hacked or that I was sharing my account. The minute after I installed this update, I attempted to activate my PS4 as primary, it activated instantly. Previously it would tell me that it couldn't activate as my primary ps4 because another system was already registered as my primary. Sony also refused to tell me whether or not my SKU matched the one registered as my primary (which would've confirmed a problem in the PS4's ability to recognize itself as primary, rather than another actual device being the primary)