Can't boot any operating system other than Fedora after following the nullr0ute guide

Could somebody please help me to boot an operating system on my Pinebook Pro other than Fedora? After following this guide (, I successfully installed U-Boot to my PBP's SPI flash. I love Fedora, but I would really like to have the option to boot another OS from MicroSD or USB without having to zero out the SPI flash (and thus rendering my Fedora install unbootable). I really don't know where to begin, so any help would be appreciated!

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