J700m rebooting problem - Samsung Galaxy J7 Questions & Answers

yo guys!
So, months ago I flashed a custom ROM on my j700m, it was EnigmaUX, it worked fine for quite a long time, but I had a issue with it that bothered me: sometimes, when the phone rebooted, it just wont accept my pattern and kept saying it was wrong until I rebooted the phone again. With that in mind, I decided to flash a new ROM to try fixing this problem, I flashed the NOUGAT 7.1.1 - SE 8.5 & GAMING and along with the previous issue I had, I also got a new one: my phone kept rebooting randomly, sometimes the system wont even start back, I had to remove the battery in order to start, it's like the phone reboots in the middle of the start process. My next attempt was to flash the stock rom, which is: J700MUBU2BRC2, and the problem is still happening. The pattern bug stills happens too, that's the weird thing, I removed the ROM and I still have the same glitch... like it was not completely removed.
Does anyone have any ideia what's causing that?

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[Q] My phone doesn't reboot after an update, i have to manually put it on..

Hello fellow xda-ers,
I have a OnePlus One, but i cannot seem to update the phone.
What is the exact problem?
- there is a system update ready, so i download the update and it asks me to install and then it tries to reboot
- the phone shuts down and doesn't reboot, i have to manually turn the phone off which makes the update sequence stop.
- the phone tells me again theres a update, but it doesnt reboot after it shuts down.
- even just giving the phone the command to reboot, just shuts the phone off and the phone doesn't reboot.
What did i try?
- via oneplus toolkit (mac) i flashed it to stock default, but still the problem persists.
- i flashed a 5.1.1. firmware straight from cyanogen mod, but still the problem persists.
- i flashed a custom recovery (while unchecking the update cm recovery), but the problem still persists.
I don't know what to do... Anybody have advice? It would be much appreciated.
I am pretty aware of what to do and not to do, i have been flashing phones since the iPhone 3gs. But this is just odd.
I was having similar problem. Except mine was booting into the bootloader. From there I tried to manually install the update. It kept failing so I gave up. Then about a week later (today) I let it try to install and it seemed to be working, except when it finally booted back up, it had completely wiped my phone!!! Now I'm midway though reinstalling all my apps and it gives me the "There's an update available for you phone". So apparently it didn't even update in that process.
I've got the exact same problem here.

[2016]Random Reboots on my ONE. Please help.

Later edit5: Tried to restore my nandroid backup and TWRP froze. Had to hard reboot the phone...
Later edit4: It started working. It f***** started working. Out of nowere. Last night, the last thing i tried was this: https://forums.oneplus.net/threads/fix-for-sudden-death-and-boot-loop.146107/
I rebooted the phone and it didn't work. I gave up.
This morning I turned it back on and ... surprise, surprise... it started working (optimizing apps and actually booting into cos12.1).
My happiness didn't last because as soon as the phone started updating some apps, it crashed, and entered a boot loop again. Good thing i managed to copy one of my previous backups.
Can someone explain this behavior?
Later edit3: my phone is still stuck in a bootloop. Neither roms are working.
Things I've tried:
- flash new roms
- erase/ flash persist
- flash color os
Nothing works!
Later edit2: while on cm13, i plugged it in to recharge. While connected to wall plug it did nothing(working fine, as it should be). As soon as i unplugged it started rebooting over and over again... a boot loop. This phone is starting to look like one of the biggest mistakes i ever made. I regret purchasing it.
Later edit: now it just turned off, and pressing the power button won't turn it back on. Had to press it for about 10 - 15 seconds. ANNOYING!
OP: I've been experiencing random reboots on my oneplus ONE since I've had it.
When i first got the phone, i was so excited about it and started flashing custom roms, just for fun and to see which one suites me. I messed up the phone (my camera wouldn't work anymore. All the roms gave me the same message"Camera has stopped working" ) and sent it back to warranty, here in my country, at the shop from which i've bought it. After two weeks they sent it back to me with the note "restored to factory settings". I've checked the "About" section and it was running cos12.1, 1 jan 2016 security patch, kernel 3.4.67.
So I've decided to stick with this rom because I didn't want to mess it up again. But, out of nowhere it rebooted. First i thought that it was an app that needed the phone to reboot. I didn't mind it. I've left my phone over the night and in the morning it was saying "enter pin" as it has rebooted.
Long story short, ever since it reboots at least 1 time a day, and it is getting really frustrating! Sometimes when i'm in an app, sometimes when it just lays around.
Reasons it rebooted:
- no reason, just siting and it rebooted
- opened waze app
- browsing chrome
- tried to connect to a saved wireless network, it rebooted and afterwards the network was not recognized anymore and had to retype the password
- no reason!!! just sitting!!
- fresh install of cos 12.1, i queued about 20 apps to install... it rebooted and continued installing after reboot.
- sometimes i heavily use it and it runs perfectly, but when i stop using the phone and lay it down it reboots. (this only happend one time)
Things I've tried:
- factory reset
- clear cache and dalvik cache
- power cicle the phone
- new rom
None of these worked.
Today I installed sultans CM13, with his 3.4.0 - sultan - caf kernel, hoping that my problems would disappear. (I installed TWRP 2.8.7.0.5, flashed the rom, cleared the cache, flashed the gapps, cleared the cache and reboot.)
It ran flawlessly. I've installed all my apps, played a little with it, configured it as I pleased and I've left it the table for about 15 minutes. When i picked it up, it rebooted(AGAIN!) out of nowhere.
What could it be? As I read through the forums i found out that a log with the exact problem is impossible to get because it gets deleted.
Could it be the wireless network? Could it be the sim card I am using or the phone modem? Could it be because of the launcher?
(for now, i've disabled my sim pin so when my phone reboots i don't miss phone calls if i don't notice it has rebooted)
Please help, as this problem is getting more and more frustrating...
Reboot log
Quickly after a reboot i reconnected the phone, opened cmd and typed adb logcat.
This is the log. 22:17 is the time when the phone rebooted so i extracted only that fragment of the log.
I am going to flash the stock cm13 nightly with the "stock" version of gapps. (until now i always flashed "nano").

Stock rom keeps corrupting, advice please.

Sorry if its been asked, i tried a search but couldnt match my problem.
I bought a used samsung s6 for my son, it seemed fine when we checked it.
But its got an odd bug where if it restarts it gets stuck on boot up.
I've used smart switch to reinstall the offical samsung stock rom
The re-install all his apps.
The phone works fine and re-boots fine.
But after a few days, if restarted it wont boot and just gets stuck on the boot loadung screen. None of the special boot options helps, clearing cache or reset.
The only fix is to use smart switch to do a complete wipe and reinstall official software.It has never had Knox tripped, and the guy didnt seem to be the type to run a custom rom.
It getting to be a pain as he cant turn his phone off and if his battery runs down gis ogone will become useless until i re-set it and wipe all his data and settings. Which I have to do on an almost weekly basis
I have a few questions...
Is it a hardware issue? (It the stock rom on a phone thats never been modded afaik)
anybody know whats causing this to bomb in stock firmware?
Any idea how to fix it?
Would a custom rom fix it?
mega_bite said:
Sorry if its been asked, i tried a search but couldnt match my problem.
I bought a used samsung s6 for my son, it seemed fine when we checked it.
But its got an odd bug where if it restarts it gets stuck on boot up.
I've used smart switch to reinstall the offical samsung stock rom
The re-install all his apps.
The phone works fine and re-boots fine.
But after a few days, if restarted it wont boot and just gets stuck on the boot loadung screen. None of the special boot options helps, clearing cache or reset.
The only fix is to use smart switch to do a complete wipe and reinstall official software.It has never had Knox tripped, and the guy didnt seem to be the type to run a custom rom.
It getting to be a pain as he cant turn his phone off and if his battery runs down gis ogone will become useless until i re-set it and wipe all his data and settings. Which I have to do on an almost weekly basis
I have a few questions...
Is it a hardware issue? (It the stock rom on a phone thats never been modded afaik)
anybody know whats causing this to bomb in stock firmware?
Any idea how to fix it?
Would a custom rom fix it?
Click to expand...
Click to collapse
I had this problem with my brand new S6 when I first got it. Yes, random reboots were occurring every now and then, which I could live with. Then one day it just got stuck at the boot logo and didn't boot no matter how many times I re-flashed stock firmware with Odin. Turns out it was an issue with the Main Board inside the phone. Once I got it repaired it's been fine ever since.
U99Dev said:
I had this problem with my brand new S6 when I first got it. Yes, random reboots were occurring every now and then, which I could live with. Then one day it just got stuck at the boot logo and didn't boot no matter how many times I re-flashed stock firmware with Odin. Turns out it was an issue with the Main Board inside the phone. Once I got it repaired it's been fine ever since.
Click to expand...
Click to collapse
Hello, I am having the same problems (random reboots), very anoying. How did you make the statement your issue was with the Main Board ? And what was the repairation about ?
Thanks
GaspardM said:
Hello, I am having the same problems (random reboots), very anoying. How did you make the statement your issue was with the Main Board ? And what was the repairation about ?
Thanks
Click to expand...
Click to collapse
The reparations involved replacing the entire Main Board with a new one.

Galaxy S6 - freezing and rebooting 50+ times a day

I've got a Vodafone UK version SM-G920F that has recently started to freeze, crash and reboot constantly.
I managed to back up my data and perform a factory reset from the Setting page, but it crashed 10+ times during the install process (would freeze at various different stages, either rebooting on its own, or requiring a Vol Down+Power reset)
I'm now on a fresh install, but it's still rebooting constantly. I managed to use it like normal for an hour today, but right now it's just rebooted 3 times and won't even get past the Samsung loading screen without several Vol Down+Power resets.
What other options do I have? And is anyone aware of a known hardware issue that could cause this?
I was considering flashing a different ROM, but I'm scared it would reboot during the process and corrupt something...
robjg said:
I've got a Vodafone UK version SM-G920F that has recently started to freeze, crash and reboot constantly.
I managed to back up my data and perform a factory reset from the Setting page, but it crashed 10+ times during the install process (would freeze at various different stages, either rebooting on its own, or requiring a Vol Down+Power reset)
I'm now on a fresh install, but it's still rebooting constantly. I managed to use it like normal for an hour today, but right now it's just rebooted 3 times and won't even get past the Samsung loading screen without several Vol Down+Power resets.
What other options do I have? And is anyone aware of a known hardware issue that could cause this?
I was considering flashing a different ROM, but I'm scared it would reboot during the process and corrupt something...
Click to expand...
Click to collapse
Maybe a battery issue?
a friend just gave me his very same model phone with the very same issues.. if I find out anything I'll tell you here, or if you solve it first please write down what you did.
Thanks Vibbuz.
I've been trying to download a stock firmware to flash via Odin, but download speeds from Updato are really bad.
So I managed to flash a firmware after installing Odin on a Windows laptop (painful trying to get it to work on my Mac)
Firmware installed OK, but after boot I was getting a constant "com.sec.epdg" pop-up box that wouldn't let me use the phone at all. Not sure if that's due to the tsar3000 firmware?
Wiped the cache and did a factory reset after booting into recovery, and now it's stuck in a boot-loop again (95% of the time it hangs at the Samsung logo animation)
Just tried using SamFirm v0.3.6 to find the correct file. Downloaded a 4gb file, but several attempts to extract only gives BL, CP, CSC files but no AP (throws up an Unknown Error during process).
So still stumped!
Yet another update. Left Updato running overnight and downloaded a firmware.
Flashed it with Odin, claims to have succeeded but phone then reboots and hangs at "Erasing" stage (Android logo is spinning, then stops)
I'm starting to think it's pretty broken...
I've been having this exact same issue since June. If your phone happens to boot try activating power saving mode (to reduce cpu speed) as soon as possible.
It seems that doing that diminished the frequency in which my phone rebooted. If it also helps you it might be a faulty battery that can't provide enough voltage. (I'm not 100% sure on this part though, just thought of it because of the apple batteries drama)
Please post your results! Looks like a lot of people are affected by this and it would be great if we could find the cause of the problem.
I just read your thread actually! Sounds very similar to mine.
I've got nowhere. I don't think it's hard-bricked as I can still access Odin mode on the phone, and sometimes boots to Recovery, but it freezes and various different points and is currently unusable (either freezes at Samsung logo, "Erasing" part after installing firmware, or once it started to run though new device setup then froze).
Went ahead and bought an S8, but still want to fix the S6!
robjg said:
I've got a Vodafone UK version SM-G920F that has recently started to freeze, crash and reboot constantly.
I managed to back up my data and perform a factory reset from the Setting page, but it crashed 10+ times during the install process (would freeze at various different stages, either rebooting on its own, or requiring a Vol Down+Power reset)
I'm now on a fresh install, but it's still rebooting constantly. I managed to use it like normal for an hour today, but right now it's just rebooted 3 times and won't even get past the Samsung loading screen without several Vol Down+Power resets.
What other options do I have? And is anyone aware of a known hardware issue that could cause this?
I was considering flashing a different ROM, but I'm scared it would reboot during the process and corrupt something...
Click to expand...
Click to collapse
Does it have twrp? Try a non stock ROM and kernel
So did anyone manage to find an issue in this rebooting. I am having the same issue.
damir_nis said:
So did anyone manage to find an issue in this rebooting. I am having the same issue.
Click to expand...
Click to collapse
Hi I have same Problem I send the my s6 for repairmen that Saied me this problem related to mobile Hard drive.
I didn't believe it and try some official rom and a rom from Philippine GLB solve my problem for 3 M/o but now developed as same problem whitout any successful rom installation.
I think this problem from incompatibility google play store version to my rom. please flash a custom rom without google apps and immediately after installation turned off data and Wi-Fi internet after 2 day whit sim card whit out any change in setting can use it.
Hello,
anyone found some kind of solution? Happened to me also - freezing, restarts and then my S6 stopped working.. Sometimes I can boot to recovery menu, sometimes it boots up to android (and then freezes again), but the chances are almost non existing. Service man told me the same thing as @ghasemzm - eMMC failure. Yes, it is completely possible, but i don't wanna believe it, because they only tried to reflash the rom. I've made some "google research" and found that there were some issues in power IC on S6/S6E. Could this be related to it?
ghasemzm said:
Hi I have same Problem I send the my s6 for repairmen that Saied me this problem related to mobile Hard drive.
I didn't believe it and try some official rom and a rom from Philippine GLB solve my problem for 3 M/o but now developed as same problem whitout any successful rom installation.
I think this problem from incompatibility google play store version to my rom. please flash a custom rom without google apps and immediately after installation turned off data and Wi-Fi internet after 2 day whit sim card whit out any change in setting can use it.
Click to expand...
Click to collapse
Will test the theory and let the group know.
So i have installed philipines latest update 6.0.1 i think with PIT file provided on Sammobile.
I have tested it for a day with normal ussage like i set up every other phone and it still continued restarting.
Figured out let me test with no google account signed in and the phone is working perfectly. For a full day.
So i dont know what the problem is but i will try again with google account tomorrow for a day see what happens.
After that will install 7.0.1 uk update with PIT file for it and test with that.
I have the same problem and I am quite sure that it is the mobile hard drive.
I tried to use F2FS but didn't find a working rom for that.
Samsung refused repair because of root.... Never Samsung again!
same issues here - any solutions found? My best guess is hardware fault...

Debugging J7 Prime Restart issue

Pardon for a long story but someone gave this Samsung J7 Prime(SM-G610F) to me with an issue "An Error Has Occurred While Updating The Device Software". So I gave Samsung Smart Switch a try sadly they removed the Initialize option and old version don't seam to do what it suppose to do so I wen to a traditional Odin flashing. I then look for a stock rom for the phone that I think is the right one. Started with android 6 MM region pakistan and flashing went well. I was able to use it for a good hour or two until I notice it restarted by it self, then it keeps doing it 10-20 seconds after booting up. I though its the firmware I'm using so I went and look for Oreo version this time I region india (I don't know if region matters). So I flashed it again and tested the device again. I'm still able to use it for a good while till it restarted again. I then keep testing it to see what may be causing the problem. I notice that when the WIFI is on it just crash the phone to reboot so as soon as the phone reboots I turned the wifi off and it didn't crash anymore. I then factory reset the phone cleared everything, wipe cache then installed benchmark tools first. Thing I notice is it crashes when Google Play store is trying to install or download something. I tested it a couple of times to see when it crash and it does crash when downloading or installing something. I was still able to install 3Dmark and run it with wifi off. It completed the test without crashing so it couldn't the processor issue. I then look for another rom and tried flashing it. This time I had issue with it failing at system.img even if I use recent rom that worked. I then keep trying till flashing TWRP worked and flashing the rest of the rom is fine again.
What bothers me is why doesn't it crash during the first couple of hours. I've search similar issues and they say it may have been and app issue. I've already disabled bunch of app but nothing changed. Run the phone in safe mode but this time instead of crashing and rebooting right away it freezes for a few seconds. I suspect if google play or something being an issue since I've tried disabling it and it didn't crash for a couple of hours. Looked for allot of related thread but none of them seam to solve my problem.
I suspect either its the rom that I'm using and it can only be fixed by using the original rom, or its having a memory issue but don't know how to pin point it. Anyone can suggest on how I can debug this? I'm used to debugging things in real time and my knowledge with android is a quite slim but as a programming understanding the errors won't be a problem. I hope.
Edit: Hmm. Does copying kernel log with TWRP work or the kernel logs get overwritten every time the phone reboots? Because I see the kernet logs but don't see anything failing except for something saying SHUTDOWN but I don't think thats it. :S
Still no reply. :S I think its /system dismounting it self while doing a write operation. but it doesn't trigger until a certain amount of time after the phone is flashed or factory reset. I have to go to recovery and mount system back but that only happens on marshmallow. over version it remounts it self after the random reboot. After factory reset I'm able to install COD mobile and play a couple of match. after a long while it just decides to reboot.
I also tried z3x and after reading PIT from phone OK. the phone just reboots and flashing completes without it doing any flashing.

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