Background & Identification
The HP ZBook 15u G3 was released in 2016 as a workstation laptop weighing approximately 4.8 lb. It has dimensions of: 15.1 x 10.2x 0.8 in.
The model number which is exactly HP ZBook 15u G3 is on the bottom side of the device. Any number ending with other combination of characters like "G5" or "G6 "is not this device. You can find it at the far left under the thermovent.
Additional Links
End-of-Life Disassembly Instructions