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I installed a ROM meant for Galaxy S3 on my Galaxy S2 phone by mistake and now the phone won't boot.

I can get into Download Mode fine but I can't get to Recovery Mode because the ROM installed a S3 specific recovery as well.

How do I fix it?

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Go to Download Mode and flash Galaxy S2 firmware/recovery using heimdall or Odin (over USB). There's no other way.

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heimdall is IMHO the better way to do this, it's also available for Mac, Win, Linux (github or original project site) – ce4 Sep 13 '12 at 18:13
@ce4 Thanks. Added that to answer... – Evil Angel Sep 13 '12 at 18:57

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