I'm pretty sure, I can make xrgn command write to any region if this command is implemented at all, including region 12 (this would make boot.bin crash, but anyway).
Over-USB region writing (updater.exe) and reading (gda.exe) has some prohibited regions too. And it's a different story, it's not like update.txt commands. I'm not so sure in this case.
In both cases region data is written using HWM_write_rgn function, which has some limitation too. And the way it works exactly is like unexplored space for me.
Learn how to disassemble ARM code, and you would be not worse than me![]()
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