Try F2 to get into the BIOS and adjust the boot settings there.
As I recall, some Gateway's used to disable the boot menu (so you'd have to enable it in the UEFI).
There may be difficulties in booting from USB due to the UEFI (which means that you may have to change some settings in there).
I'm not real good with these settings, but they involve disabling Secure Boot and enableing CSM or Legacy mode.
I'd look for specific instructions over at Gateway support for your model.
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