Не могу загрузиться с флэшки

https://wiki.archlinux.org/index.php/HP_Spectre_x360_13-w023dx

Installation

Installing arch is straight forward for everything (disable secure boot, F10 for BIOS, F9 for boot options) but one thing: you may have to disable a BIOS option called «fast boot». While this option is activated in BIOS the machine may boot into Windows no matter what you select. If you make to boot into the latest arch ISO (June 2016) on a USB, arch EFI boot menu hangs. After you installed arch on HDD and moved all of M$ Windows to /dev/null, you may activate that option again. Although no difference in boot performance could be observed with the option activated or deactivated.

fast boot

Эта хрень отключена? Ну и потыкай в порты USB2.0/USB3.0, флешку поменяй, попробуй арч. Если уверен что текущий образ записан нормально.