Librem 14 Pureboot - Red text artifacts

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Fresh install of Debian on L14

Ok this may be an incredibly stupid question (I’m pretty new to linux) but m trying to install a fresh copy of Debian 10 on my L14 and when booting to a USB drive, once selecting the install I get a bunch of purple lines at the top of the screen as if its trying to use the incorrect screen resolution at which point I get stuck. Has anyone experienced something similar and has a workaround? I did hunt down another thread referring to an install of version 11 which as I’m aware hasn’t been releas…