Problem to install driver to upgrade firmware

Dear cymatic Team,
i purchased the lp16 1 week ago via thomann, i installed utools and created a ST playlist. erverything works relativly well.
When i put in the usb-stick lp says “disk error! this memory device is not supported”, i format it with the lp, same problem, with windows FAT32, same problem. Now i’ve found out that i only have to remove the stick and put it in again, then everxthing is alright and i can select my playlist and go. But now one song is not able to be played back. So, I checked the firmware of my lp and realized that 83859 is a pretty old version. So i wanted to update the firmwear, and prior to that, install the drivers for my windows 7 PC. Problem: I can not update: The install shield says that i have to disconnect an reconnect the device i want to install and turn it on. When i am doing that the lp16 shows me that i am connected to MAC (??) and the install shield shows the same message, i redo all steps now for quite a while and looking around for some answers… What can i do??
Is there an option to run an firmware-upgrade from an usb-stick? is it normal that the lp shows me MAC when i am connected to a PC?

Thanks in advance,
Stefan

edit: sorry, i saw that i posted in the wrong category 🙁