I've no information about Hyundai installing new infotainment devices on newest Tucson cars but it would be possible. Or may be that device is the same and new versions of the software have changed the way of accessing WinCE. Another way to get into WinCE is using diagmode.guid file on a pendrive to access TestMode. This file must have this string: C32EF9B8-7C3B-4b19-8535-1D18FDC9BB0F
If it works, the Testmode->Test1 screen in System section contains the "Go Out" button which terminates Hyundai's software and shows WinCE explorer. Again, if this works, I would copy LISA.exe from \MMCMemory\Storage Card\System\ in a pendrive (\MD) supposing these paths remain to be the same in that device, to analyze it and verify that these codes have changed or to try to identify the new way to access Windows.
There's another approach to this problem that involves the use of a technique to autorun a program, making system to believe that there's a new version of the firmware upgrader called Aerith. If this procedure has not been changed, LISA would execute the desired program once SD card is inserted. This program would kill all Hyundai's software and launch explorer.exe. It may work but, due to you are dealing with an unknown OS in an unknown device, the behaviour would be unpredictable and dangerous. The target in this case is to access WinCE to get and analyze the software and should be performed by experienced users.
Anyway in 2017, I would be surprised that Hyundai would use WinCE on a new device after complaints of its customers instead of Android.
JKD Thanks for the hints. I will let you know how it went. He could not solve the problem even using the testmode. So he will try to use the copy of my USB, which is working properly.
keep you informed