that old 1.5 update was labled wrong it was actually 1.0, here is the real 1.5 update went live 5 min ago.
308mb
dus01.ps4.update.playstation.net/update/ps4/image/2013_1112/sys_df008b5601f4a214a3cc65030a02ac4a/PS4UPDATE.PUP
Will I be able to install system software update 1.50 via a USB drive?
Yes, you will be able to download the firmware to your PC and transfer it to PS4 using a USB memory stick.
However, to use the USB method the first time you take PS4 out of the box and before installing system software update 1.50, you’ll need to enable safe mode. When PS4 is powered off, press and hold the Power Button for seven seconds to enter safe mode. Note: Users should only update using official files downloaded from PlayStation.com.