The general consensus of the issues is that the system runs extremely slowly after the patch and is therefore virtually unusable. For some it’s even more: “Yes, this patch definitely crashed my console, I can’t do anything anymore and it takes forever to switch between menus,” wrote a user named TheIronGhost. The Redditor later described that after several reboots it was at least able to get the PS Store to work, but not anymore.
Other PS4 owners describe similar issues, with some apps cannot be started, with other error messages appearing or they cannot connect their controllers. But apparently there is a possible workaround: because there are reports that the console should be disconnected from power for a few hours, after which it could or should work again. Those who prefer not to take risks should do without firmware 9.00 for now, at least until Sony is able to get to the bottom of it.