Help please

I want to install macOS Tahoe on a HP Elitebook 850 G3 but I am stuck.

Downloaded the EFI and Kexts, downloaded USBToolbox.kext as well as UTBmap.kext, added them to the kernel in OC Auxilliary Tool.

Then downloaded the recovery image.
Formated the USB Stick in GUID, FAT32, non bootable with RUFUSand put both the EFI folder and the recovery image on the USB stick. Secure boot is disabled.

When I try to boot from USB I see a start menu only with an entry for Windows.

Can somebody please help resolve this issue.

Thank you very in advance.