Samsung I5800 Galaxy 3 hard reset with buttons
Press MIDDLE of the VOLUME + MENU(middle key) + POWER ON for 1-2 sec. Release Power. Recovery menu appears.
Select Wipe Data/ Factory reset with volume down, then press MENU, then select Yes - delete all user... press MENU or POWER button to hard reset i5800 Galaxy 3 battery must be fully 100% charged.
DOWNLOADING = Volume down + MENU + POWER. Release POWER after 1-2 sec
VOLUME UP + MENU + POWER = FORCED UPLOADING by KEY pressing
Use this method to hard reset your Samsung I5800 Galaxy 3 Android phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
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