My understanding is that AnyRegionChanger is disabled as of firmware update 3.4 and the earlier quasi-update that still reads as 3.3, so you're probably out of luck.
I've messed up my region using AnyRegionChanger, and believe me, if your region was messed up you wouldn't be able to run any software at all.
I would recommend trying GeckoOS or MenuLoader, neither one of which should pose any risk to your system.
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