Chosen Solution
MacBook Pro 15" Retina A1398 Does changing UK keyboard for German one require me to update or flash some kind of firmware or update software? I have replaced keyboard from UK to German and now I have information that something is draining too much power and the USB has to be disabled. El Captain is giving me kernel crash pointing towards USB xhci and not booting, Updating to High Sierra gives me sleep/wakeup failure pointing towards USB and two dead USB ports (but SD card reader and HDMI working just fine) and info about drawing too much power, downgrading to Mountain Lion makes one of USB (left side) working but I think as USB 2.0 and second one dead but no sleep/wake problems whatsoever, and upgrading to Yosemite leaves computer with same problem as in Mountain Lion. But beside working good with one USB port. I’m not sure if changing keyboard to different language should be made with some software servicing? Sorry I have forgot to add that I have also done SMC and NVRAM resets and hardware test showing all good.
Just to clarify a bit more there are a few different uppercases for this system and to add to it there are different cases between the different years of this series! The Mid 2012 and Early 2013 share the same case and keyboards. The Late 2013 and Mid 2014 also share the same case and keyboard. And lastly, the case and keyboards of the Mid 2015 are still different again! Then we have two case types for each of these three groups The US and the ISO layout. Only the ISO series have language specific keycaps which can be popped off and swapped out. If you decide to take your system apart to switch out the uppercase’s or if you are willing to dig deeper and take the uppercase apart replacing the keyboard alone you do run the risk of putting in the wrong version of the keyboard as they look exactly the same if you’re not careful! I’m thinking that might have happened here.
