Related
TL;DR: I have flashed the stock 4.2.1 image through fastboot, and yet my n7 wifi still reboots continuously at the google screen with the little unlocked lock.
Background: I have had the device for about 3 months, no real problems with it before this. I was reading yesterday night and i fell asleep, and thus instead of being on my desk all night the device was under a blanket. When i woke up, I opened the cover and found it on the google screen with the lock. It was warm, but not incredibly so. I thought it was weird that it had rebooted and apparently frozen, but i held down the power to turn it off. when i turned it back on, it started the google screen, then went black, then started the google screen again. Seems like there may be some sort of a kernel issue that is keeping it from booting. The next thing i did was to go into recovery (had CWM at this point, and it was rooted as well but that's a moot point if i can't get into the system.) and i did a backup, then wiped data and did a restore from the backup that i had just made. after rebooting, it made it all the way into the system, and seemed ok. I set it down, and a few moments later it turned off and started doing the loopy google screen thing again. Next, I went into recovery and wiped data/factory reset, and tried to boot up. no luck, still looping. Next, i grabbed the 4.0 toolkit from the dev section and tried to flash the stock recovery from that, but it was proving troublesome so i just downloaded the image myself and fastbooted then replaced cwm with the stock recovery, wiped everything, and flashed the 4.2.1 image. that should have worked, from what i understand, but no, still being loopy. I re-wiped and flashed, tried 4.1.2 instead, that didn't work, and i re-did 4.2.1. after flashing 4.2.1 and then leaving it boot looping for a little while, i noticed that it sometimes made it into the boot animation and then the animation froze and it rebooted and looped more. after a few more tries, powering it off, leaving it for a few min, and powering it on again, it booted all the way to the welcome screen to pick a language and then froze. some number of loops later, it made it all the way to picking a wifi network and froze. I have yet to make it past that point. Thinking it may help, i fastbooted CWM onto the device, so i have a more capable recovery now. I am now going to look into pushing a non stock rom to the device to see if that will help at all.
Any ideas on what on earth could have caused this? Was it just that the device was a little warmer than usual for a while?
Any ideas on how i can fix this? Much appreciated!
Lastly, should i consider looking at sending it back to google? I didn't think there was anything wrong with the hardware, but i'm not sure.
Thanks!
Update: After leaving the system repeating it's loopy boot thing for about 45 min, it seems to have finally booted into the system, and has yet to reboot again. I have no idea why this happened in the first case, nor why this finally worked in the end, but so far it seems ok.
More: Ok, so it still seems to be looping a lot. I have no idea why still. I'm having trouble getting it to boot back into the system, so hopefully something helps fix this.
Ok, so a day later it seems to have settled down such that there's very little looping on the google logo screen any more; now it just tends to randomly reboot when in use. this is quite frustrating, but seems more similar to what others have reported to be the case with 4.2.1. oddly, i never had these reboot issues before it decided to fail the first time, so i'm not sure if this is just because ii'm on 4.2.1. I may look at flashing back to 4.1.2 and staying there, i suppose it can't hurt. does anyone else have any ideas as to what could be going on?
Hey guys, i have been owning this piece of great phone for almost two years. But it never gave me a big issue.
Nevertheless, few months back i flashed cm12 and it worked great too.. I had been using it gracefully till i decided to update to cm12.1. So i decided to update, but the update always crashed google play services. The update did not happen automatically so i had to flash the zip through custom recovery (already installed) by myself.
I could not come out of that so i went ahead and did a full wipe and flashed cm12.1 along with gapps. Since then when i am unplugged it goes only to about few minutes (on battery) and shuts down. So, i now decided that this piece of update is buggy and did a full wipe and reflashed the original cm12 zip and gapps which i had placed in the first place. But, to my horror even this time it could not go past the bootscreen even and turns itself off when its about to start up. (Battery is full charged, did an overnight charge as well).One very unusual thing i noticed that almost all the the time i try to power it on it showed me "optimising app X of Y" which is weird. This kinda happens only on first boot.
But if i keep my phone plugged in to ac charge then it works fine.. but only last night it hanged and turned off even on charge. So there i decided that the cm thing is not for me. So i followed this tutorial and flashed the stock 5.1.1 rom (did a full wipe, tried oem lock and re unlocked and proceeded too).
But, i find the same problem same issue!! When unplugged my device, it just turns off even on full battery charge.
Can someone explain me the technical parts of the issue and what has gone wrong and how it can be fixed?
Please, Thanks
EDIT
Last time i locked - unlocked bootloader and proceeded with a fresh factory image flash, the device turned off on boot even when plugged in to my mac and it's hot on the back side
Sounds to me like there''s something physically wrong with the phone, probably the battery. Time for a new one anyway. Lithium batteries degrade with use. After ~500 charge cycles it'll have lost upwards of 20% of its original capacity and might show other signs of wearing out like inconsistent voltages. After 2 years of use, you'll be well beyond 500 cycles. A new battery off eBay is pretty cheap, and some sellers include the needed tools.Go to ifixit.com for a tear-down guide. A hair drier can help soften up the adhesive. The fact that it turned off despite being plugged in to your computer also points to the battery being toast - the USB amperage from a computer is less than the typical wall charger.
If it's not the battery giving you woes, I don't know what it could be.
And FYI, the whole "optimizing app" thing is the OS rebuilding the cache. When you flash your GAPPs package or a zipped Titanium backup it has to build the cache for the new apps. Same as when you do the "wipe Dalvik and cache" part of standard flashing procedure to avoid conflicts. In order for apps to load quickly, Android stores a lot of the necessary data in cache, so when you clear it or have new apps, it has to rebuild the cache. On Lollipop this takes a loooooooong time because of the way ART works.
Planterz said:
The fact that it turned off despite being plugged in to your computer also points to the battery being toast - the USB amperage from a computer is less than the typical wall charger.
If it's not the battery giving you woes, I don't know what it could be.
Click to expand...
Click to collapse
How can i be completely sure that it's the battery which needs to be replaced? The battery shows charge. When i plug in and boot up it shows enough battery power left.
Currently, without external power it does not go past the google screen on boot. When i plug in power while device is off, the battery meter shows just a little depletion from full charge. When turned on, battery level is 82 %
After all , all this hardware mess up can be the consequence of a bad cm flash ?
the whole "optimizing app" thing is the OS rebuilding the cache.
Click to expand...
Click to collapse
I know this. Earlier it was happening on each boot. Now it seemed to be stopped.
By any chance did you have your phone charging while flashing and booting up your ROM?
ChainFires Son said:
By any chance did you have your phone charging while flashing and booting up your ROM?
Click to expand...
Click to collapse
May be? But not the the first time
Nezam said:
Hey guys, i have been owning this piece of great phone for almost two years. But it never gave me a big issue.
Nevertheless, few months back i flashed cm12 and it worked great too.. I had been using it gracefully till i decided to update to cm12.1. So i decided to update, but the update always crashed google play services. The update did not happen automatically so i had to flash the zip through custom recovery (already installed) by myself.
I could not come out of that so i went ahead and did a full wipe and flashed cm12.1 along with gapps. Since then when i am unplugged it goes only to about few minutes (on battery) and shuts down. So, i now decided that this piece of update is buggy and did a full wipe and reflashed the original cm12 zip and gapps which i had placed in the first place. But, to my horror even this time it could not go past the bootscreen even and turns itself off when its about to start up. (Battery is full charged, did an overnight charge as well).One very unusual thing i noticed that almost all the the time i try to power it on it showed me "optimising app X of Y" which is weird. This kinda happens only on first boot.
But if i keep my phone plugged in to ac charge then it works fine.. but only last night it hanged and turned off even on charge. So there i decided that the cm thing is not for me. So i followed this tutorial and flashed the stock 5.1.1 rom (did a full wipe, tried oem lock and re unlocked and proceeded too).
But, i find the same problem same issue!! When unplugged my device, it just turns off even on full battery charge.
Can someone explain me the technical parts of the issue and what has gone wrong and how it can be fixed?
Please, Thanks
EDIT
Last time i locked - unlocked bootloader and proceeded with a fresh factory image flash, the device turned off on boot even when plugged in to my mac and it's hot on the back side
Click to expand...
Click to collapse
Exactly same problem is started with my Nexus 4 ... I really wonder, what is causing this. Meanwhile, have it sorted for you ? is that hardware (Battery) issue?
Nezam said:
Hey guys, i have been owning this piece of great phone for almost two years. But it never gave me a big issue.
Nevertheless, few months back i flashed cm12 and it worked great too.. I had been using it gracefully till i decided to update to cm12.1. So i decided to update, but the update always crashed google play services. The update did not happen automatically so i had to flash the zip through custom recovery (already installed) by myself...
Click to expand...
Click to collapse
I too am facing kinda similar problem.
It first started on my stock Lollipop 5.1.1. I had kept it on charge and when I removed it, it got switched off. Thinking that it might be just another of the multitude of bugs in Lollipop, since I already had lots of problems with it, I decided to flash CM 12.1 Stable on it.
Unlocked bootloader, flashed TWRP recovery, created a backup (using TWRP), wiped data, cache, dalvik and started installing CM 12.1. Now comes the problem, I selected 'restart system' and it did restart and CyanogenMod logo was displayed for few minutes before the phone crashed. I switched it on again normally and the Google logo got displayed, and then again phone got off just after the Google logo. I tried flashing again by same procedure, but this time not even the Cyanogen logo was displayed. The Google logo got displayed and the went off.
Then I decided to restore the backup. Restored it but it still had the same problem at the startup Google logo.
Now I have managed to install CM 12.1, which works fine unless I don't open certain apps. When I open certain apps like Phone or Clock (those are some I have tried yet), it crashes the system.
This maybe a hardware or software problem, but pretty sure it isn't battery problem, coz it retains good charge when I switch it back on after crash.
shazR00t said:
I too am facing kinda similar problem.
It first started on my stock Lollipop 5.1.1. I had kept it on charge and when I removed it, it got switched off. Thinking that it might be just another of the multitude of bugs in Lollipop, since I already had lots of problems with it, I decided to flash CM 12.1 Stable on it.
Unlocked bootloader, flashed TWRP recovery, created a backup (using TWRP), wiped data, cache, dalvik and started installing CM 12.1. Now comes the problem, I selected 'restart system' and it did restart and CyanogenMod logo was displayed for few minutes before the phone crashed. I switched it on again normally and the Google logo got displayed, and then again phone got off just after the Google logo. I tried flashing again by same procedure, but this time not even the Cyanogen logo was displayed. The Google logo got displayed and the went off.
Then I decided to restore the backup. Restored it but it still had the same problem at the startup Google logo.
Now I have managed to install CM 12.1, which works fine unless I don't open certain apps. When I open certain apps like Phone or Clock (those are some I have tried yet), it crashes the system.
This maybe a hardware or software problem, but pretty sure it isn't battery problem, coz it retains good charge when I switch it back on after crash.
Click to expand...
Click to collapse
Since you already unlocked the bootloader, and therefore already wiped everything, you could try flashing a factory image.
I also got the same problem. I thought this is battery problem, so I replaced the battery but problem still there. I thought this is problem of lollipop, never installed CM or anything. It is always running stock android. After that I even downgrade to Kitkat stock version still it is not working. One more thing I noticed is If I don't unlock the device than it will be powered on, but as soon as I unlock it and if it is not plugged in to charger it will be switched off. Any suggestion what should I do?
I have the same thing for several month now.
Always thought it is the dying battery.
theminikiller said:
Since you already unlocked the bootloader, and therefore already wiped everything, you could try flashing a factory image.
Click to expand...
Click to collapse
Just tried flashing Lollipop 5.1.1 (LMY48I) factory image. The same problem still exists. Faced few weird problems on running the first time. Following scenarios explains it exactly...
Not On Charge: Crashes after startup Google logo
Connected to Laptop (USB Charge): Crashes a few minutess after entering "Optimizing apps" screen
On Charger (AC): Completed the install (optimizing apps and setup) without problems
Now I can access the home screen and menu without problems. But when I start any app, phone will go off. Not just apps, at times even when the recent apps menu is opened.
shazR00t said:
Just tried flashing Lollipop 5.1.1 (LMY48I) factory image. The same problem still exists. Faced few weird problems on running the first time. Following scenarios explains it exactly...
Not On Charge: Crashes after startup Google logo
Connected to Laptop (USB Charge): Crashes a few minutess after entering "Optimizing apps" screen
On Charger (AC): Completed the install (optimizing apps and setup) without problems
Now I can access the home screen and menu without problems. But when I start any app, phone will go off. Not just apps, at times even when the recent apps menu is opened.
Click to expand...
Click to collapse
When you flashed the factory image did you do it via fastboot or by flashing a zip file. If you used the zip file I would suggest you do it with fastboot.
theminikiller said:
When you flashed the factory image did you do it via fastboot or by flashing a zip file. If you used the zip file I would suggest you do it with fastboot.
Click to expand...
Click to collapse
By "flashing zip" you mean using "fastboot update" command? ...If so, nope I didnt. I extracted all compressed files and then flashed each of the img's using fastboot. Flashed a total of 6 img files.
shazR00t said:
By "flashing zip" you mean using "fastboot update" command? ...If so, nope I didnt. I extracted all compressed files and then flashed each of the img's using fastboot. Flashed a total of 6 img files.
Click to expand...
Click to collapse
Yeah, I meant flashing each of the image files. If you did that then u don't have any other suggestions.
Sent from my Nexus 4 using Tapatalk
---------- Post added at 20:42 ---------- Previous post was at 20:41 ----------
shazR00t said:
By "flashing zip" you mean using "fastboot update" command? ...If so, nope I didnt. I extracted all compressed files and then flashed each of the img's using fastboot. Flashed a total of 6 img files.
Click to expand...
Click to collapse
Yeah, I meant flashing each of the images. If you did that then I don't have any other suggestions.
Sent from my Nexus 4 using Tapatalk
I m too facing the similar issues. Phone is getting turned off suddenly when not charging, on charging it is working fine. i have done factory reset and also done factory image reset to 5.1.0. i m still facing the same issues. I don't think so it is related to battery. if anyone have the solution then please let me know.
shazR00t said:
By "flashing zip" you mean using "fastboot update" command? ...If so, nope I didnt. I extracted all compressed files and then flashed each of the img's using fastboot. Flashed a total of 6 img files.
Click to expand...
Click to collapse
Try the very basic flash technique by double clicking the flash-all.bat. It's not the same as flashing the imgs one by one.
Battery is the issue. Get it changed. I also faced same problem, and visited LG service center and they changed the battery. Phone working fine now.
gautam.is.sharma said:
Battery is the issue. Get it changed. I also faced same problem, and visited LG service center and they changed the battery. Phone working fine now.
Click to expand...
Click to collapse
Ok so Battery was the problem!! Got it changed, phone working fine now. Thanx all!
Ok guys i confirm that this is a battery issue. I took it to the service center and the guy temporarily replaced battery to show me issue solved... But... there i saw another issue due to which i did not buy the battery. I saw half the touchscreen not working (including the navigation buttons ). The guy at the center told its a h/w issue and i would have to spend 7K on it so i left my phone dead for now. The Question is ... can this be a s/w issue.. or result of bad flash which can solve on reflashing ??
same problem with my nexus ,but one thing i noticed that the phone does not power off while in recovery...Any idea??
Hey there,
I am having a recent issue with my phone, where everytime I reset it or do a power off and reboot, the phone will constantly get to the boot logo (in this case cyangemod) and reboot after 5-10 seconds.
It ends up working but only when I let it do this cycle for about 30 minutes or so.
I have looked everywhere, I cannot find someone who is having a similar problem as me.
I am running the latest Cyangemod nightly rom, because I thought the issue was the ASUS rom, I have tried wiping cache, doing a factory reset etc... but no luck.
I also have the latest TWRP recovery and unlocked bootloader.
Any help would be gladly appreciated, Thank You.
Let me know if any video evidence is needed to further clarify, the problem I am having.
Fa7aLX__x said:
Hey there,
I am having a recent issue with my phone, where everytime I reset it or do a power off and reboot, the phone will constantly get to the boot logo (in this case cyangemod) and reboot after 5-10 seconds.
It ends up working but only when I let it do this cycle for about 30 minutes or so.
I have looked everywhere, I cannot find someone who is having a similar problem as me.
I am running the latest Cyangemod nightly rom, because I thought the issue was the ASUS rom, I have tried wiping cache, doing a factory reset etc... but no luck.
I also have the latest TWRP recovery and unlocked bootloader.
Any help would be gladly appreciated, Thank You.
Let me know if any video evidence is needed to further clarify, the problem I am having.
Click to expand...
Click to collapse
Sorry I don't have good news or a solution for you. Just wanted to chime in that you aren't alone. This randomly happened to me on Sunday in the car - I noticed that I suddenly had no signal in a pretty well developed area that I frequent, so I tried restarting and I've been down ever since. Unlike you, I didn't wait it out too long, maybe 5 minutes at the most, when the phone started to get warm.
I have tried going back to stock recovery and firmware and have seen no success. Contrary to other people reporting problems, I hadn't done anything to my phone leading up to this. I think I upgraded the modem several days before, but other than that, everything was running pretty smoothly.
same thing was happening to me after a bad flash. Stock recovery, stock lolipop, wipe data and cache, boot once, reboot to recovery, flash latest MM package on asus's site.
This is the only thing that fixed the bootloops.
I'm currently running the latest PureNexus (MM) with a pretty vanilla setup, I.e. no xposed, root, etc. All the sudden yesterday I had a hard crash while doing nothing in particular, a sudden reboot that sent me into a boot loop. It reboots right before the boot animation would appear. The only way I was able to fix it was to wipe the data partition. I was subsequently able to restore my backup and it booted successfully. The frustrating part is it's happened several times since then. In fact I can't keep it running more than a few hours without the same thing happening, even after doing a full wipe. Any ideas?
Thanks!
Arg, I tried flashing the new Android N system image (the official one) which basically flashes every partition and I'm still getting a boot loop. Is it possible that my SD card went bad?
ts_mpls said:
Arg, I tried flashing the new Android N system image (the official one) which basically flashes every partition and I'm still getting a boot loop. Is it possible that my SD card went bad?
Click to expand...
Click to collapse
Did you use flash-all.bat from google image or you flashed the images one by one?
I tried both. Both N and MM. Apparently I stumped Google too, they're sending me a new one.
that's weird... Glad you got a replacement though!
My Zte axon 7 for last few days has been mostly stuck on a red led for until the battery dies then I plug it in and it boots normal and functions good for 20 mins until it freezes with a red led and I have to do it all over again. I was in TWRP running linage os and it still froze in TWRP which I was suprised. Has anyone else had this issue because I'm not finding much on the internet for it.
sonic1337 said:
My Zte axon 7 for last few days has been mostly stuck on a red led for until the battery dies then I plug it in and it boots normal and functions good for 20 mins until it freezes with a red led and I have to do it all over again. I was in TWRP running linage os and it still froze in TWRP which I was suprised. Has anyone else had this issue because I'm not finding much on the internet for it.
Click to expand...
Click to collapse
yes,me.Also on 10% phone shut down,then i try to turn it on and it says i need to charge my battery,i ignore it.Then i try to boot in TWRP and that works.
Also vendor partition issues,other time on boot its gone,other time in reboot its back
calibration issues also here that i noticed,what more users have but not aware about
Have you found a work around for this to prevent it from happening or to make it work longer. I do not know what causes it. I hesitate to format cause I got some pictures. But I will if it comes to it.
sonic1337 said:
Have you found a work around for this to prevent it from happening or to make it work longer. I do not know what causes it. I hesitate to format cause I got some pictures. But I will if it comes to it.
Click to expand...
Click to collapse
Try to flash latest official twrp trough fastboot or edl.If it worked boot in twrp and try to backup your photos to PC/laptop.
Then I advice you start over.Also delete the vendor partitions.
Please report back here when the twrp flash and backup to pc succeeded
Predatorhaze said:
Try to flash latest official twrp trough fastboot or edl.If it worked boot in twrp and try to backup your photos to PC/laptop.
Then I advice you start over.Also delete the vendor partitions.
Please report back here when the twrp flash and backup to pc succeeded
Click to expand...
Click to collapse
I will try doing this, unfortantly luck isn't on my side for this. In short I did this process 1 year ago forgetting how to do it, as well as I am now on windows 8.1 (previous Wind 7) and the drivers are very hard to get working as when the phone previously worked it would be hard to get it to detect the phpne using Usb 2.0. Just send me a tut on how to flash Lastest version of TWRP and ill do it. Also how do I clear the Vendor partions? I mainly had the intention to set this phpne up once and never come back to all this so thats why I have nothing ready for this.
Also what if it freezes while i'm usimg TWRP? I had that happen to me before
Predatorhaze said:
Try to flash latest official twrp trough fastboot or edl.If it worked boot in twrp and try to backup your photos to PC/laptop.
Then I advice you start over.Also delete the vendor partitions.
Please report back here when the twrp flash and backup to pc succeeded
Click to expand...
Click to collapse
Is this the method you used to fix it?
sonic1337 said:
Is this the method you used to fix it?
Click to expand...
Click to collapse
yes,and then reverted back to los 14.
I have same problems now again,with the rebooting,power loss,fake 0 battery capacity.
i dont know what the cause is,but for me it happen only with vendor partition installed with los15 bootstack etc
im trying to fix it again
Predatorhaze said:
yes,and then reverted back to los 14.
I have same problems now again,with the rebooting,power loss,fake 0 battery capacity.
i dont know what the cause is,but for me it happen only with vendor partition installed with los15 bootstack etc
im trying to fix it again
Click to expand...
Click to collapse
Ok what i'm going to do is erase the entire device, flash TWRP then the default Rom and see if it still happens.
sonic1337 said:
Ok what i'm going to do is erase the entire device, flash TWRP then the default Rom and see if it still happens.
Click to expand...
Click to collapse
u mean stock rom? what i did was ersing everything,also the vendor partition.I rebooted sometimes in twrp to make sure everything is gone and all partitions are on default size.And im glad i did this because the vendor partition showed up again after some reboot in twrp.
Then i installed everything for los14.1 (bootstack and modem) and flashed nuclearom (all default).Ive run some cycles on that and my problems were all solved.Battery calibration was also normal and good
Same issue, more details, with year old B32 system
Just want to add, having same issue. When phone is unplugged, battery starts draining quickly, in fifteen minutes reaching 70%. IF it reaches that far. Usually, battery just jumps from any % to 0! and shuts off, even from 100% charge sometimes, and can't restart phone until I plug it in. When plugged in, it shows wherever it shut down, for example if it shut down at 76% on charging it shows 76%.
Looking at posts above, I wiped everything, including data and media, did a complete reflash to B32 stock image by DrakenFX that I did literally a year ago. STILL same issue remains, battery starts discharging very quickly, then from 95% skips to 0! and shuts off.
Hope this is helpful to anyone dealing with this issue.
vereshchagin said:
Just want to add, having same issue. When phone is unplugged, battery starts draining quickly, in fifteen minutes reaching 70%. IF it reaches that far. Usually, battery just jumps from any % to 0! and shuts off, even from 100% charge sometimes, and can't restart phone until I plug it in. When plugged in, it shows wherever it shut down, for example if it shut down at 76% on charging it shows 76%.
Looking at posts above, I wiped everything, including data and media, did a complete reflash to B32 stock image by DrakenFX that I did literally a year ago. STILL same issue remains, battery starts discharging very quickly, then from 95% skips to 0! and shuts off.
Hope this is helpful to anyone dealing with this issue.
Click to expand...
Click to collapse
that must be your battery. Install Ampere, and disconnect the phone while it is at 100%. See how much voltage it reports. If it says it's at ~95% and has less than 4.3V then it's definitely just a very bad battery with high internal resistance, this causes it to drop voltage easily once a load is applied, and the phone detects the low voltage and shuts off to prevent bad stuff from happening
Does the phone look like it's warped somewhere? Your battery might be bloating