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I followed this tutorial and everything went fine on the initial setup, it even build the initial pokefirered.gba file successfully. But now no matter what I do to try and make that file again to test the first changes I've made to a file I get this error:
/bin/bash: arm-none-eabi-as: command...
Restricted mode is in fact built into (and made slightly more restrictive in) Hardcore mode. No way to turn it off, it's always active as an added factor for making this version of the game obscenely difficult.