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Thread: Troubleshooting Samsung Galaxy Phone Bootloop

  1. #1
    Super Moderator Astrix's Avatar
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    Troubleshooting Samsung Galaxy Phone Bootloop

    Troubleshooting Samsung Galaxy Phone Bootloop


    What is Bootloop?

    Bootloop is a condition when boot process is fails to enter homescreen and repeat boot process over and over again. Starting from after the power button is pressed, the display turn on to a certain logo and die again.

    Booting process in Samsung Galaxy Phone


    Here is the booting phase in Samsung Galaxy Phone

    * Boot First phase is do by bootloader, mark with Samsung Galaxy Phone Logo, in this step boot recognize the partition.
    * Boot Second phase, bootloader will call recovery to check every necessary files and in this phase also check is any application install queue, if yes it would go to install the application/Rom/Firmware/kernel, else it will go to next phase
    * Boot Third phase, bootloader will load pertition/system, you`ll see animate Samsung logo. In this phase all running files include Dalvik Virtual Machine (DVM) that will read one by one the applications that will load to Operating System and save the result in partition/data.

    The Cause of Bootloop

    Bootloop troubles can classified by the cause, there are:

    Bootloop trouble because recovery

    Galaxy Phone will booting but stuck at Samsung logo, then the screen goes black and you can see that backlight. Next the screen will completely turn off and galaxy phone start to boot again.
    The trouble came from incompatibles recovery or corrupted recovery file.

    Bootloop trouble because file/system corrupted

    Galaxy phone will boot until the third phase, Samsung animate logo, and screen goes black then the device will reboot. Fortunately, in this case the recovery mode still can be access.
    The trouble came from a corrupt petitions / system / data

    Bootloop trouble because the animated files is not compatible

    It`s almost similar traits with Bootloop troubles because recovery, but the different, in this case recovery mode still can be access.
    The troubles came from bootanimation.zip that are not compatible with device

    Bootloop trouble because new incompatibles applications

    It` similar traits with Bootloop trouble because file/system corrupted but the difference it`s not reboot after the animated logo appear. For turn it off you need press and hold the power button for 15 sec then the galaxy phone will shut down.
    The troubles came from installed application that cannot read /load by DVM

    Fix Bootloop troubles

    Bootloop isn`t the end of the world, I mean it can be fix. Every Bootloop problem have their own treatments. Except Bootloop that cause by recovery, at other troubles bootloader menu still can be access. In other words, we can fix Bootloop using recovery.

    Fix Bootloop trouble because recovery

    1. Go to download menu.
    2. Using ODIN install stock recovery to Galaxy Phone


    Fix Bootloop trouble because file/system corrupted

    * Go to recovery mode.
    * Using ClockWorkMod do cache wipe/data wipe and Dalvik cache wipe.
    * Using Stock Recovery, do factory reset (warning!! This action will delete all data in SDcard)


    Fix Bootloop trouble because the animated files is not compatible

    Method I : Install the correct bootanimation.zip from recovery
    Method II : install custom ROM through recovery
    Method III : Install Stock Rom through ODIN

    Fix Bootloop trouble because new incompatibles applications

    Method I: Install custom ROM through recovery, then do reset factory
    Method II: Install stock ROM through ODIN then do reset factory

    Make a backup file

    Factory reset will delete all data you have, including installed application, personal data and phone setting.

    Make backup file will save your time to reinstall applications or reconfiguration the phone.

    Backup file can make using ODIN or Recovery. If your Galaxy Phone is already using ClockWorkMod, so you can use ADB features that included in KIES installation.

    Last edited by Astrix; 02-13-2013 at 02:35 AM.

  2. #2
    Member DeJavu's Avatar
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    Very nice Astrix, thanks!
    Astrix likes this.

  3. #3
    Dez
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    Exclamation Need Help please

    My note 2 gt-n7100 is frozen and will not boot up past the Samsung opening logo.
    When I plug it in and try to restart a grey colored battery logo with loading circle icon in the middle of battery logo appears to stay frozen on the screen

  4. #4
    Junior Member DesElms's Avatar
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    Actually, the OP left out one additional possible cause... in this case, a physical one: A stuck power button.

    If you've ever cleaned an old-fashioned Windows computer mouse -- the kind with a rubber ball in it -- then you have seen the usually-black, fuzzy, crap that comes out. Said crap (which, gratefully, isn't really crap... whew!) is body oil, dust, and godknows what else. In the case of a mouse it's often little tiny threads from the mousepad, too.

    Ick.

    Over time, that exact same stuff (minus, of course, the mousepad threads) gets caked-up down in and around the power button; and when it finally makes said button stick in a fully or partially pressed position, it can often cause the OP's "first phase" of the bootup -- the one showing the Samsung logo -- to just repeat over and over and over again.

    Since a stuck power button nevertheless has a spring trying to push it back up, it will often pop back up very, very slowly -- after maybe a half dozen boot loops, give or take -- until it's no longer making the contact which is causing the loop...

    ...and, at that point, voila!, the phone seems to snap out of it and finish booting-up.

    The solution, as I have said, for years, regarding many other phones, case of some kind which covers the power and volume rocker buttons. Many TPU skins/cases do this. Some though -- sometimes even ones that look identical to ones which cover the buttons -- have cutouts for the buttons, instead. Never get one of those. Always get a case, of whatever kind you choose, which bygolly covers those hardware electromechanical buttons. And do it when the phone is brand new, not after you've used it for a month and have already gotten some smoodge down in the tiny openings around the buttons.

    And, yes, that little thought that just flitted through your brain which sorta' almost made you ask, out loud, as you read all this, "Then what about the electromechanical HOME button? Won't it eventually do that?"

    Sadly, the answer is "yes," and I've several times wondered whom, at Samsung, I can drag behind a '79 pickup to punish him/her for such godawful design (not literally, of course). We no more needed a physical, hardware, electromechanical HOME button there than does my cat need a handcrank sticking out her butt. Just look around Youtube, and you'll fiind videos of both the non-US version of the original Note (SGH-i717), and the new Note II , wherein pressing the HOME button seems to accomplish nothing; yet the phone seems otherwise perfect. Though most of the makers of those videos have no idea what's really going on, and just assume their phones' HOME buttons are broken, and try to find apps and other means of working around it...

    ...the sad truth is that all that's wrong with most of them is that their HOME keys are dirty down inside, and need to have all the smoodge cleaned out of 'em. I've often wondered if there could be a way for a dry-apply screen protector to be made so that it covers that button, and has a little flexibility in the vertical sides of the bump in the protector which so covers, so that it could be pressed through the protector without causing said protector to pull-up around the base of the button. I've sent the idea to two screen protector makers, both of whom, I'm sure, thought I was nuts (they join my ex-wife in that), and so didn't reply (as she doesn't). (Actually, I'm just kidding. We get along fine; and she's a peach... it's just that I like to make ex-wife jokes.)

    So, bottom line, yes, by all means: Everything the OP wrote. However, before going there, bother to simply make sure that the power button isn't all smoodged-up, and sticking. It's more common than you think. These phones, if they're not modded, usually don't suffer from the kinds of likely causes set forth in the OP's OP. That said, yes, sometimes it happens and when it does, the OP's advice is bygolly good!

    Hope that helps.
    Gregg L. DesElms
    Napa, California USA
    gregg at greggdeselms dot com

  5. #5
    Junior Member DesElms's Avatar
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    Quote Originally Posted by Dez View Post
    My note 2 gt-n7100 is frozen and will not boot up past the Samsung opening logo.
    When I plug it in and try to restart a grey colored battery logo with loading circle icon in the middle of battery logo appears to stay frozen on the screen
    See what I just posted immediately below your post, to which I'm now replying. Don't know if that's it, of course, but it's worth checking out before taking more extreme measures. As the old saying goes, unless you're in Africa, when you hear hoofbeats, think horses, not zebras.
    Gregg L. DesElms
    Napa, California USA
    gregg at greggdeselms dot com

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