High Sierra installer shows HD as uninitialized

Hi after a whole day unsucessfull trying I hope someone can help me.

I try to upgrade my fully working Sierra to High Sierra. Since i'ts an older Acer M6610G machine I used MBR instead of GUID. HS installer from the appstore forces me to GUID. If I ceate an USB bootale device it can't find my HD and Diskutility shows uninitialized. If I try to delete it fails.

Kext on my USB drive: AppleAHCIPort, FakeSMC_ACPI-LPCSensors, IntelMausiEthernet, Lilu, NullCPUPowerManagement

Thanks for your help.