Gary said it's "possible to load the shareware version of Doom entirely from USB, without modifying the Alarmo." And they've put the software and instructions for running it on Github, so almost any sufficiently knowledgeable and determined Alarmo owner can do it, too.
Gary explains in a blog post that after another person called Spinda hacked the Alarmo (with a Flipper Zero) and dumped the firmware from memory, Gary worked out a method that uses a USB mode and the USB-C port to point the Alarmo to custom external firmware, instead.
Given how easy it appears to be reproduce what Gary has done, Alarmo software modding almost certainly won't just stop at Doom. Of course, how far any online community efforts to turn the Alarmo into a bizarro game console will get probably depends on how Nintendo, which has been particularly active with its copyright disputes lately, feels about it.
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