Develop Bugs

[Q] Samsung Note N7100 stuck boot loop when unplug,but when charging loads the KitKat

Hi Guys,
've flash my Samsung Galaxy Note 2 N7100 to 4.4.2 KitKat it was successful, but after a few days my note 2 keeps auto shutting down randomly and sometimes I can't turn it on from sleep. I thought I've just missed something when flashing to 4.4.2 KitKat, what I did was to re-flash it and check if I've missed something but not. After I re-flash it, I've encountered this problem. I'm stuck at boot loop, I've done the Wipe process it was successful, but it didn't fix the problem, what I've noticed is when it's NOT charging or plug to PC it is stuck at boot loop, but when I plugged it to PC or charge it it continues loading the KitKat, sometimes prompting that it's not charging.
I'm wondering what could be the problem here. I've google any possible problem, I can't find any similar problem to mine. Can anyone help?
I'm still try any possible way to fix... HELP!

Dennis_Arlo said:
Hi Guys,
've flash my Samsung Galaxy Note 2 N7100 to 4.4.2 KitKat it was successful, but after a few days my note 2 keeps auto shutting down randomly and sometimes I can't turn it on from sleep. I thought I've just missed something when flashing to 4.4.2 KitKat, what I did was to re-flash it and check if I've missed something but not. After I re-flash it, I've encountered this problem. I'm stuck at boot loop, I've done the Wipe process it was successful, but it didn't fix the problem, what I've noticed is when it's NOT charging or plug to PC it is stuck at boot loop, but when I plugged it to PC or charge it it continues loading the KitKat, sometimes prompting that it's not charging.
I'm wondering what could be the problem here. I've google any possible problem, I can't find any similar problem to mine. Can anyone help?
I'm still try any possible way to fix... HELP!
Click to expand...
Click to collapse
Ive just encountered the same problem. Were u able to find a solution?

Shahin7631 said:
Ive just encountered the same problem. Were u able to find a solution?
Click to expand...
Click to collapse
I exactly encounter the same issue on my Note II. It seems that the automatic reboot (then the boot loop) when the phone is unplugged is generated with apps (or system) using internet connection or the camera.
Please help ! :crying:

Dennis_Arlo said:
Hi Guys,
've flash my Samsung Galaxy Note 2 N7100 to 4.4.2 KitKat it was successful, but after a few days my note 2 keeps auto shutting down randomly and sometimes I can't turn it on from sleep. I thought I've just missed something when flashing to 4.4.2 KitKat, what I did was to re-flash it and check if I've missed something but not. After I re-flash it, I've encountered this problem. I'm stuck at boot loop, I've done the Wipe process it was successful, but it didn't fix the problem, what I've noticed is when it's NOT charging or plug to PC it is stuck at boot loop, but when I plugged it to PC or charge it it continues loading the KitKat, sometimes prompting that it's not charging.
I'm wondering what could be the problem here. I've google any possible problem, I can't find any similar problem to mine. Can anyone help?
I'm still try any possible way to fix... HELP!
Click to expand...
Click to collapse
I had a similar problem with my note 2 N7100.
It used to reboot every 30 minutes.
The best solution was to reinstall the firmware using ODIN.
First you need to download the firmware from sammobile and put the phone in download mode and install it.
Hope this solution helps you too.

anish100 said:
I had a similar problem with my note 2 N7100.
It used to reboot every 30 minutes.
The best solution was to reinstall the firmware using ODIN.
First you need to download the firmware from sammobile and put the phone in download mode and install it.
Hope this solution helps you too.
Click to expand...
Click to collapse
Thank you anish. I already tried this solution (with stock firmware and Cyanogenmod 10.3 &11) but it didn't work for me
The phone boot only happens when I unplug the USB cable and launch an app. If I do nothing after unplugging the cable the phone don't boot immediatly.

GStriker said:
Thank you anish. I already tried this solution (with stock firmware and Cyanogenmod 10.3 &11) but it didn't work for me
The phone boot only happens when I unplug the USB cable and launch an app. If I do nothing after unplugging the cable the phone don't boot immediatly.
Click to expand...
Click to collapse
Hi guys ! I finally found a temporary work around to avoid automatic reboot. After multiple tests I noticed that the issue seems to come from CPU usage.My phone never went to deep sleep and often stayed around 1600MHz.
The work around was to go to Preferences > Performances > Processor/CPU > Strategy select "userspace" . The CPU goes down to 800MHz but I don't have any more automatic reboot when the USB cable is unplugged.
After reboot the boot loop is still there (so I need to put back in the USB cable to boot normally). I was wondering if the boot loop comes from the boot.img file...

GStriker said:
I exactly encounter the same issue on my Note II. It seems that the automatic reboot (then the boot loop) when the phone is unplugged is generated with apps (or system) using internet connection or the camera.
Please help ! :crying:
Click to expand...
Click to collapse
Ive literally tried everything .even repartioned the phone . it works fine in recovery and download mode but as soon as i want too boot to android unplugged it restarts . when plugged it has no problem

Funny thing. I have a factory Sprint Note 2 with the latest kitkat updat and I am experiencing the same problem. Phone has not been rooted or messed with. If anybody come across a solution let me know. I booted the phone and unplugged the power button to verify and it does the same thing. Only stays on when in airplane mode or charging.
One more thing. I tried somewhat to do what was posted above about performance / cpu power. I put the phone in powersave mode and checked limit cpu and is is fully operation. problem gone. If I turn power save mode off I'm back to square one.
To late. Took a picture by mistake and phone jumped into boot loop.

i have GT-N7100 and same problem phone is stuck on boot loop when unpluged
---------- Post added at 04:22 PM ---------- Previous post was at 03:24 PM ----------
i just tought maybe it needs new battery. cause before i unpluged it it showed 67% then bootlooped 2x then i pluged back in and it shows me only 5%. i think its battery cause it cant dishcharge in 1 or 2min

My initial problems were that it would drop signal and show an x with no bars intermittently. then i started having problems anytime the phone demanded use. Picture, internet, video. tried a few things listed above. Still would go into a boot loop when not plugged in. Battery would charge normally and show it percentage like normal. It would reach 100% with no difference in charge time. When battery saver is on it would not have a problem unless I use an app that demands more cpu usage, network connection, battery consumption. Put a new battery and problem is gone. some people say the battery show swelling but my battery looks identical to the new one. no swelling and it is not deformed in any way.

It also solves the problem for me ...but i dont know what to do after the restart ...have u found a permenant solution

Shahin7631 said:
It also solves the problem for me ...but i dont know what to do after the restart ...have u found a permenant solution
Click to expand...
Click to collapse
I was thinking. If you flashed with a bad battery whats there to keep it from affecting the flash / update. The stock system doesn"t allow an update unless the battery is charged. It doesn't know if the battery is faulty. Try to reflash after a new battery has been reinstalled and charged to full. It's just a thought.

dcmobiletech said:
I was thinking. If you flashed with a bad battery whats there to keep it from affecting the flash / update. The stock system doesn"t allow an update unless the battery is charged. It doesn't know if the battery is faulty. Try to reflash after a new battery has been reinstalled and charged to full. It's just a thought.
Click to expand...
Click to collapse
Ive tried already with another battery ....its a very strange situation while everything works fine in download or recovery mode when its unplugged ...i have ordered a third party battery to see if it'll make a difference or not ....i'll keep u updated tomorrow

GStriker said:
Hi guys ! I finally found a temporary work around to avoid automatic reboot. After multiple tests I noticed that the issue seems to come from CPU usage.My phone never went to deep sleep and often stayed around 1600MHz.
The work around was to go to Preferences > Performances > Processor/CPU > Strategy select "userspace" . The CPU goes down to 800MHz but I don't have any more automatic reboot when the USB cable is unplugged.
After reboot the boot loop is still there (so I need to put back in the USB cable to boot normally). I was wondering if the boot loop comes from the boot.img file...
Click to expand...
Click to collapse
Where is the Preferences section? I am unable to find that on my Note 2 settings.

Experienced the same thing and this is the first time I had this. I was playing a game after I fully charged my battery and suddenly it turns off. So I waited for it to turn on where I noticed that it keeps on turning on and off and stuck on the " Samsung Galaxy Note 2" logo screen. Then I tried several things like clearing the cache and dalvik but it just do the same thing. I re-flashed the 4.4 ROM that I was using but sadly it does the same thing. I then noticed that if I plug in the charger it works normally and does not boot loop. And as soon as I remove the charger it will keep on restarting on and off on that screen. I was thinking that it might be a hardware failure or the battery itself. So I went to recovery mode and unplugged the charger, it stays on. Went to download mode without the charger and it stays on. Freakin' weird. I am about to flash a different ROM and will wipe everything and see what happens...

Fully charged the battery to 100%, unplugged the charger and it started to boot loop again. I allowed it to boot loop once and immediately went to recovery mode and saw that my fully charged battery went down to 3%. Tried different ROMS (Omega, DN3, and Phoenix), I still have this issue. Now can use my Note2 as long as the charger is plugged in...

Change your battery and solve the problem ?
Sent from my GT-N7100 using XDA Free mobile app

I did. Case closed!

red_hanks said:
I did. Case closed!
Click to expand...
Click to collapse
is it working fine after battery change? does it still get stuck in boot loop? mobile networks?

It works perfectly !

Black Screen, Blinking Red and Blue LED after boot

Hi all,
Before someone says it, yes I did look around for other threads before posting one of my own. I was not able to find the problem that I am having, nor a working solution.
I am currently running CM12.1 on a Sprint G3 (LS990). This morning, I woke up and found that my phone had frozen while charging overnight. No problem, this has happened before, so I unplugged it and pulled the battery out and rebooted. It was working fine, and then I noticed an update for CM. I hit download, and went to go brush my teeth. When I came back, I saw that it had frozen mid-download. Now it wasn't installing anything; the CM built in updater was just downloading the latest nightly. I waited 5 minutes for it to become responsive, but it never happened so I pulled the battery once again.
Now when I held the power button to start my phone, I saw the LG splash screen as normal. After that, the screen went dark and the LED began blinking red and blue. No matter how many times I pulled the battery to reset my phone, this would occur. I attempted to enter Recovery mode, but in this case after the splash screen the LED would briefly light up blue, and then the phone would reboot, and the cycle would repeat. The same would occur when I tried to boot into download mode.
So now that I cannot boot into anything at all, I assume that my phone is bricked. It is still covered under the limited manufacturer warranty, and since I can't boot up at all I assume it doesn't matter that it is rooted, but before I contact LG I would like to see if anyone here has any ideas.

Before sending it back, have you tried to use the KDZ tool to restore it?
http://forum.xda-developers.com/showthread.php?t=2785089

RapHaeL_4_4_4_ said:
Before sending it back, have you tried to use the KDZ tool to restore it?
http://forum.xda-developers.com/showthread.php?t=2785089
Click to expand...
Click to collapse
That requires the phone to be in Download mode, and it won't enter Download mode, so I have not tried that.

Well, this happened to me after I flashed TWRP from Flashify on my LG G3 D855 in the day before yesterday and I just had to take the battery out and put it back in, and then I had to boot into download mode. Since you can't even boot into download mode, I'm almost sure the phone is bricked

FelipeGouliouras said:
Well, this happened to me after I flashed TWRP from Flashify on my LG G3 D855 in the day before yesterday and I just had to take the battery out and put it back in, and then I had to boot into download mode. Since you can't even boot into download mode, I'm almost sure the phone is bricked
Click to expand...
Click to collapse
Yeah I assumed as much. Sent it to LG today, so thank you guys for trying to help.

ashingtondc said:
Yeah I assumed as much. Sent it to LG today, so thank you guys for trying to help.
Click to expand...
Click to collapse
You HAVE to flash your phone if it was rooted or bump'd, otherwise, it won't be under warrenty, even if it don't boot, they're not stupid..
Every post have: "Your warranty is now void." in it for a reason.

Help, Optimus g pro frequent restarting

My optimus g pro restarts automatically sometimes turns off, this started a day ago after flashing a custom rom. Now i have flashed back to stock and the problem still persist. this doesnt happen when in recovery mode

Try rebooting the phone in safe mode and check.keep you phone in safe mode for the whole night.You can check whether your phone restared or not in the battery settings.Go to settings< Battery< Battery usage.there will be a graph of the usage.If your phone restarted,you can see a gap in between the graph( a while line between the graph).in safe mode,many issues like this are cleared.:sorry for my bad english.
---------- Post added at 09:20 AM ---------- Previous post was at 09:20 AM ----------
Herodox said:
My optimus g pro restarts automatically sometimes turns off, this started a day ago after flashing a custom rom. Now i have flashed back to stock and the problem still persist. this doesnt happen when in recovery mode
Click to expand...
Click to collapse
Try rebooting the phone in safe mode and check.keep you phone in safe mode for the whole night.You can check whether your phone restared or not in the battery settings.Go to settings< Battery< Battery usage.there will be a graph of the usage.If your phone restarted,you can see a gap in between the graph( a while line between the graph).in safe mode,many issues like this are cleared.:sorry for my bad english.

krishna13 said:
Try rebooting the phone in safe mode and check.keep you phone in safe mode for the whole night.You can check whether your phone restared or not in the battery settings.Go to settings< Battery< Battery usage.there will be a graph of the usage.If your phone restarted,you can see a gap in between the graph( a while line between the graph).in safe mode,many issues like this are cleared.:sorry for my bad english.
---------- Post added at 09:20 AM ---------- Previous post was at 09:20 AM ----------
Try rebooting the phone in safe mode and check.keep you phone in safe mode for the whole night.You can check whether your phone restared or not in the battery settings.Go to settings< Battery< Battery usage.there will be a graph of the usage.If your phone restarted,you can see a gap in between the graph( a while line between the graph).in safe mode,many issues like this are cleared.:sorry for my bad english.
Click to expand...
Click to collapse
I think itz the battery cause my phone doesnt boot pass the lg logo before it goes of or restarts unless charger is connect, it will boots fully

Herodox said:
My optimus g pro restarts automatically sometimes turns off, this started a day ago after flashing a custom rom. Now i have flashed back to stock and the problem still persist. this doesnt happen when in recovery mode
Click to expand...
Click to collapse
How have you flashed back to stock (KDZ, backup via recovery...)? Boot into the recovery and clear caches and try again.

ShadySquirrel said:
How have you flashed back to stock (KDZ, backup via recovery...)? Boot into the recovery and clear caches and try again.
Click to expand...
Click to collapse
Flashed tot using LG Flashtool, theres no custom recovery installed since its on stock and i cant install a custom recovery since my phone cant boot pass the lg logo before it goes off

Herodox said:
My optimus g pro restarts automatically sometimes turns off, this started a day ago after flashing a custom rom. Now i have flashed back to stock and the problem still persist. this doesnt happen when in recovery mode
Click to expand...
Click to collapse
Yes yes.i forgot to mention that.even if there is fault with the battery,the frequent restart happens.try with the other battery who has the same phone.ur frnds or neighbours.

Herodox said:
Flashed tot using LG Flashtool, theres no custom recovery installed since its on stock and i cant install a custom recovery since my phone cant boot pass the lg logo before it goes off
Click to expand...
Click to collapse
Have you flashed with CSE mode or update mode?

Is it rebooting or powering off? If it's powering off, then it's most likely be the bad battery. Ever since I got my device about a year ago, two of my batteries have gone bad. One was the OEM that came with the phone, another was the zerolemon I bought. So check the battery and see if that's the problem.

D855 Stuck in Bootloop-- Light Sensor and Vibration Still Work

I'm having a weird problem. Yesterday I was using my phone as I normally do-- texting, playing simple puzzle games, etc.-- when I noticed the battery was at about 2%. I wasn't very concerned so I tried to send one last text before it died. Shortly afterward it died with the usual "Powering Down" alert. I thought absolutely nothing of it and once I had access to a charger, I did what I normally do: I turn on my phone, wait for it to get past the LG splash screen, and I plug it in once it gets to the boot animation. I do this so my phone will turn on instead of going into charge only mode. Also, like usual, my phone's screen dimmed seconds after the boot animation began (I assume from my automatic light sensor settings), and I could feel it vibrating a little (also something it typically does upon boot).
However this is as far as it got. I was very confused when about an hour later, the phone still hadn't completed boot. I removed the battery, inserted it again, and tried once more telling myself that I would wait as long as I could instead of just an hour. Booting the second time gave me identical results-- everything is normal (light sensor response and vibration indicating the phone is powering on) yet it gets stuck. The only difference is that this time I got to see the entire bootloop.
After the boot animation screen has run for a while, I get the usual "Android is starting.... Optimizing app ## of ##" (#= actual numbers). Once it finishes, instead of booting my phone, it begins the boot animation again. If left alone it will cycle between the boot animation and the "Android is Starting" screen indefinitely.
TL;DR:
1. ) Caught in bootloop between boot animation screen and "Android is Starting... Optimizing app ## of ##" screen.
2. ) The screen still dims and there are little vibrations that usually tell me the phone is about to turn on.
I have tried:
- a hard reset- this yields only a slightly stronger vibration and it starts the bootloop again.
- Download mode- this does the same as the hard reset
- Removing battery for a while- no results
- Full charge to completely dead to full charge again on charge only mode- no results
I am running CM13 Nightlies from late February (not completely sure which exact date). Which I flashed without issue about a month ago. I do have Xposed and run various modules, but I was using nothing at the time and hadn't for about a month. My computer recognizes my phone as an LG G3 Device, but refuses to access any files.
Any help would be greatly appreciated!!

Phone not starting.
First remove phone battery, insert it again, do not start phone. Connect your phone to original charger and charge it, while charging with the charger start your phone. Your phone should start if yes/no report me immediately. Your phone battery is failing to start your phone (Due to Low Voltage in battery). Replace with original battery.

jit1108 said:
First remove phone battery, insert it again, do not start phone. Connect your phone to original charger and charge it, while charging with the charger start your phone. Your phone should start if yes/no report me immediately. Your phone battery is failing to start your phone (Due to Low Voltage in battery). Replace with original battery.
Click to expand...
Click to collapse
Alright, I removed the battery, reinserted it (without turning the phone on) plugged it into the wall charger (seeing the charge only battery animation), and attempted to turn it on. Whenever I try to turn my phone on after plugging it in, I get the LG splash screen followed by the battery charging animation. It never reaches the boot animation. I'll let it charge for a while and try again.
Thank you for the advice!

Okay, I let the phone charge completely and attempted to turn it on whilst plugged into the wall charger again. Unfortunately I had the same issue. The phone shows the LG splash screen and then the battery charging animation again-- no boot animation.

musiceas66 said:
Okay, I let the phone charge completely and attempted to turn it on whilst plugged into the wall charger again. Unfortunately I had the same issue. The phone shows the LG splash screen and then the battery charging animation again-- no boot animation.
Click to expand...
Click to collapse
just start with a full reflash , if it doesnt boot up its simply broken

Jhinta said:
just start with a full reflash , if it doesnt boot up its simply broken
Click to expand...
Click to collapse
Yeah, I'm trying to avoid a full reflash/data wipe. Since I haven't messed around with any Xposed modules or root apps, I also haven't backed up anything for quite a while. No abnormal apps were running before the battery died, which leads me to believe this can be solved somehow without a full wipe.
Also, I tried to use my boyfriend's battery to boot up my phone. I thought it might be a bad battery-- as some people on-line have mentioned. Unfortunately, it still refused to boot and it produced the same bootloop.

You see , if and not and this and that dont help . te only way to save files is to get acces by recovery or boot, you cant boot but possible you have recovery so start saving your files you need. when you have or dont have your files . you stil need your system to boot for that to happen, it needs to work. so flashing a default rom with wipe sould work if it doesnt you flash original if that doesnt work its dead
Verstuurd vanaf mijn LG-D855 met Tapatalk

I think I forgot to mention, I cannot access recovery mode. I have the latest TWRP installed, but attempting to boot into recovery gives me the same results-- endless bootanimation/ "Android is Starting" bootloop.

So no acces at all . so what do you do ? Read above! Anyway good luck
Verstuurd vanaf mijn LG-D855 met Tapatalk

Solved
I fixed my problem. It turns out I was being an idiot and got the method of entering recovery mode on the LG G3 confused with my Samsung tablet. I should be able to fix the bootloop on my own now. Thanks everyone for your help! Cheers to idiocy.

Hey, I have the exact same issue right now. Did you solve your problem, and how? I tried removing the battery and charging with original charger to 100%. I connected it to my PC, went into Download mode and clicked "Restore Upgrade Errors" in LG PC Suite. It successfully flashed the firmware update, then it said "Android is starting.... Optimizing app ## of ##". But after that it restarted into bootlop again. Also I noticed that sometimes it vibrates, and my LED (light sensor) doesn't light up anymore.
Any advice? I haven't tried replacing the battery yet.

simon710 said:
Hey, I have the exact same issue right now. Did you solve your problem, and how? I tried removing the battery and charging with original charger to 100%. I connected it to my PC, went into Download mode and clicked "Restore Upgrade Errors" in LG PC Suite. It successfully flashed the firmware update, then it said "Android is starting.... Optimizing app ## of ##". But after that it restarted into bootlop again. Also I noticed that sometimes it vibrates, and my LED (light sensor) doesn't light up anymore.
Any advice? I haven't tried replacing the battery yet.
Click to expand...
Click to collapse
Hi i have the same problem with my lg g3 d855, after a reflash hi is start and do android optimazig after the tel is start and do this over and over. help please

Hi, the solution that worked for me was to
1. install drivers
2.install LGUP
3.flash "LGD855P_D855P10a_04" - found here https://drive.google.com/file/d/18tlmVNK_ba0jIapJy-Sz5wamxbIXh8xH/view

Another LG G3 brick in the world

Hi everyone,
First to begin, sorry for my frenglish.
My lovely G3 seems to be bricked since few days.
5 days ago, after a reboot, it stucked 30 sec on the moving LG logo screen and turned off. I tried to enter into TWRP, I had the TWRP menu but it suddenly shut off again. My battery was getting old , so I bought a new one ( a Polarcell).
Now I can't even get TWRP. When I switch on, I have sometimes LG logo five sec, sometimes just a black screen.
If I connect on USB, the device is not recognised (error 43).
If I try the download mode, I have the first screen with "download" written in very small and after a few seconds: black screen and device not recognised.
I installed LG drivers, Qualcomm driver... nothing much...
I'm kind of desperate, can't affort to buy a new mobile phone.
If someone has any advice... many thanks
Fred

I entered again into TWRP... but maybe 10 secondes after the screen shut off....

inhib said:
I entered again into TWRP... but maybe 10 secondes after the screen shut off....
Click to expand...
Click to collapse
Same thing happened to me, remove your battery wait 5 minutes, try again, it will last longer, also could you try flashing your latest stock rom with LGUP and report back? Mine doesn't bootloop only on latest stock.

Thanks, but the G3 was without battery during 2 hours.... I wonder how I will be able to flash anything :-/

inhib said:
Thanks, but the G3 was without battery during 2 hours.... I wonder how I will be able to flash anything :-/
Click to expand...
Click to collapse
You can try unbricking like this. Try to enter to bootloader mode without dealing with shorting the pins first, if you can make it enter into bootloader mode, you don't need to the short pins.

Thanks for the link, I had already read that but it's not very very clear. By te way, I think I 'll have to do the short pin because my G3 is not recognised as a Qualcomm, and USB keeps connecting disconnecting whend the screen is black.