Here are some tips to restore factory settings.
*#7780# - Restore factory settings – resets all the settings to the default ( you will not lose any data) Make sure you back up your data as you will lose all of it when you perform option 2 or 3 on this list. The default code for ALL operations listed here is 12345.
*#7370# - Reformat your phone (just like out of the box; Most newer Nokia phones at least N series, E series and s60 5th edition based phones have UDP – User Data Preservation so not ALL data may be lost. Still it is a good idea to always back up your stuff).
Hard Reset – Perform this as a last resort, only if nothing else works. If the phone is not showing any activity, proceed with hard formatting , turn off your phone, hold the following buttons while pressing the power button. (the default code is 12345 - hold the following buttons *, 3 (number button) and talk/green key. Turn on the phone and do not release those buttons until you see the Nokia boot up screen. Once you feel the phone power up, you can let go off the power button while still holding all three buttons.
Nokia 5800 XpressMusic – Use the following buttons to do a hard reset – GREEN/RED/CAMERA keys pressed all at once on power up and do not let go until you see the handshake screen. This will only work on 5800’s that have firmware version 20… and up. I have done this a couple of times when the phone bricked and it worked like a charm. I always install the apps in the Memory Card, so they are retained after the master reset. Any apps installed in the C:\ is deleted.
Nokia N97 (unofficial version but works) – Press SHIFT /SPACE BAR / BACKSPACE while holding the power button. Again do not let go until you see the handshake screen. If these codes are not working the only thing for you to do is contact your Nokia Care Center/Service for assistance.
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What about Nokia 5530 Xpress Music, how can we hard reset it when broken or not starting only by top-button? (that’s for hard reset, right?)