How does one re-set or edit the /system/build.prop, when changes kept it from booting up again? Rooted Optimus.

  • What were the changes you made?
    – Chahk
    May 22, 2012 at 12:39
  • bad dalvik.vm.heapsize
    – NoBugs
    May 22, 2012 at 12:53
  • Which phone do you have?
    – Chahk
    May 22, 2012 at 15:29

3 Answers 3


Try rebooting into recovery and connecting to the phone via ADB:

adb devices

It should give a message like this:

List of devices attached  
01234565ABCDEFG        recovery

You can then copy the file off the phone:

adb pull /system/build.prop c:\build.prop

You can now edit it in any text editor (recommend Notepad++ because it will preserve the Unix style line endings,) and then copy it back to the phone:

adb push c:\build.prop /system/build.prop

If the issue was indeed within that file, the phone should boot now.

  • reboot recovery how?
    – NoBugs
    May 22, 2012 at 13:49
  • Depends on the phone; it's usually different for each model. Usually you shut it off (pull the battery if you can't any other way) and then turn it on while holding a button or a combination of buttons. This should be in the manual. If not, try a Google search for "recovery mode" for your phone's model.
    – Chahk
    May 22, 2012 at 13:52
  • Ok, phone recovery doesn't seem to have done anything, just showed a different boot animation.
    – NoBugs
    May 22, 2012 at 14:53
  • 1
    Did you have a custom recovery installed to begin with?
    – Chahk
    May 22, 2012 at 15:29

You restore the backup you made before editing such a sensitive file.

rm build.prop
cp yourbackupbuild.prop build.prop

If you didn't have the foresight to make a backup, then I guess you can ask for someone with the same phone/software version to send you theirs.

  • I wasn't able to su, it gave error in adb shell
    – NoBugs
    May 22, 2012 at 12:52

I was able to restore the factory firmware using the instructions here. Worked with no problem on Windows 7. :)

I guess this is why we should use custom-recovery like Clockworkmod?

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