I recently installed HighSierra with the patch from DosDude on an iMac 8.1 (early 2008) with 4GB Ram and SSD. The computer runs very well so far. Now I noticed that when I plug in an iPhone for synchronisation via USB, for example, it is not recognised. Mouse and keyboard are recognised correctly when connected directly. But an external microphone/camera or mouse and keyboard via a USB dock are also not recognised. Can any of you help me? Thanks in advance for your help.