High Sierra 10.13.6 USB stick not visible during boot

[digital.discuss]

I successfully built a High Sierra USB stick with Unibeast 8.3.2 on my macOS 10.12 MBP, a PNY Transformer, formatted as HFS+ Journaled and partitioned with GUID Partition Map. I've booted from the stick successfully in the past, also recently, but this time with High Sierra 10.13.6 the "install macOS High Sierra" partition is not visible from Clover during boot in my current Hackintosh.

Both the "install macOS High Sierra" and "EFI" partitions are visible in Finder (first times the latter was visible), both on the MBP and the Chameleon 10.12 Hackintosh. Disk Utility finds no errors on the USB. I can select the "install macOS High Sierra" partition as start disk, but it won't boot from it, just chooses the internal Chameleon install instead. It's as if the volume is invisible during boot, but not otherwise.

Any suggestions are welcome. Not uploading config file at this time as boot doesn't commence.

 

[digital.discuss]

So I tried Macman's older suggestion in UniBeast 8.2 bug with 10.13.4 - Installer not shown in Clover - Missing IABootFiles which was this terminal command

rm -f /Volumes/Install\ macOS\ High\ Sierra/.IAPhysicalMedia

It worked!

The odd thing is that these, the folder and config file, were present in previous builds with the older High Sierra installer.