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if you guys dont read the redme file and went straight to installing the oiv, heres what you can do to undo it. go to your original unmodded update - update.rpf - common - data - levels and look for gta5.meta,image.meta and the most important heightsmap.dat. copy all that and paste it into your modded file version. or you can see inside midnight_shuto.oiv and have a look on what file that've been replaced and just replace it with your original file one. it works for me