On my 9360, the perl script just reports "You may need a BIOS/UEFI update (Kaby Lake, or Skylake-X processor)", but the script doesn't check microcode versions for kabylake, just cpu model. It appears BIOS 1.3.5 includes microcode rev 0x4e, and the updated microcode released by intel on 2017-05-11 does not have anything for the kabylake 7500U (06-8e-09)... I could be wrong. I've disabled hyperthreading on my 9360 pending some confirmation about microcode revisions...
What is Dell's response to the recent SkyLake/KabyLake hyperthreading firmware bug? Is/will this be fixed with a bios upgrade for the 9350/9360? 
Sky/Kaby lake Intel hyperthreading bug