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- resinsert battery, wait 30 sec
- press Vol Up, Home, Power at the same time
- when logo appears, release the Power button
- when Recovery menu appears, release the Home button first, then finally Vol Up
- select wipe data/factory reset (Vol UP/Down + Home)
- select reboot system now
It turned out that problems were in sterrieng switches resistance as not contacts in switches themselves. Opened switches and lubricated bit. Problems gone. Thanks for some interests and hints for this problems.
well depends on how far it turns the volume down as to what the cause is and if the volume bar on screen display comes on when the vol. goes down. if it just goes down a little you probably have the "smart sound" setting turned on in the audio menu turn it off and see if prob. goes away. if the vol. bar comes on the screen whenever the vol. goes down the you most likely have a bad button on your front panel and it doesn't have to be the vol. down button. it you think it is the button it would need solder work to be changed most likely shop job.