Everything was fine until I updated to the latest SDK version 6.0.0 and the new nRFGo ap version 1.16.1. Now when I try and connect to my device I get J-LinkV4.52c Error "Could not read AHB-AP Id. Could not connect to target". I found that if I click "Recover" it usually works after that, but I'm not super confident...
I also have problems with Keil downloading of firmware, saying "Cannot Load Flash Device Description!". I now get lots of error loading software packs errors saying things like this:
C:\Keil\ARM\PACK\NordicSemiconductor\nRF_DeviceFamilyPack\1.0.3\NordicSemiconductor.nRF_DeviceFamilyPack.pdsc(145):Error parsing node '#text' :value 'IOs' not in enumeration
