[Q] MIUI NB strange problems

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hello
i just flashed MIUI NB 1.12.2 on my SGS I9000 and i observed that my phone's home button doesn't work anymore , the notification bar tells me that i have headphones plugged in , but i don't ; and my volume keys are reversed (volume down raises the volume , whilst volume up decreases the volume) .
it's a really strange issue . when i plug my headphones into the phone , the phone starts to play the music on loudspeaker .

please help , thanks in advance and sorry if i posted in the wrong section .

did you ever fix that problem my phone is doing the exact same thing.

I had the error and reflashed and it fixed it, not sure if you've tried it but that's one idea