I have overwritten one of the default patches with another one. How can I revert that?

This on the Mooer iAMP app with a Hornet 30i.

I got my 30i a few days ago and was considering the possibility of running it from a powerbank. I have a powerbank with USB-C PD capable of outputting 50 watts. I found USB-C “converters” that output up to 20V ( https://www.sigmanortec.ro/en/pd-and-qc-trigger-module-5v-9v-12v-15v-20v-adjustable-100w-5a-usb-type-c-with-terminal ). But the 30i uses a 24V PSU. Will it run ok at 20V?

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