Not boot - Galaxy S 4 Q&A, Help & Troubleshooting

Hey i've installed s5 launcher on my s4 then say ''systemui stopped'' i've restart my phone then the phone not booting stuck on the samsung logo please help i cant install or resinstall the firmware

Try to wipe cache from the recovery.
If that doesnt work try a factory reset (you will lose your data).
If that doesn't work then you need to reflash the firmware.
Next time when you start messing with your phone make sure you have backups. That's like rule number 1 before you start modding.

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Note 3 everything stopps working after download mode

Hello!
I did root my phone yesterday and it had no problems and so, today i was gonna boot into recovery mode but did accidently boot into download mode and as there is no exit there i did just hold the power button until it turned off.
And now when i start my phone it will be a little while on the samsung logo after that its just black and i will get like play store has stoped working contacts has stopped working wtc, everything does just stops to work so what do i need to do, can i just use odin and root it again to get default settings? or can i just connect it to kies and it will give me all i need?
wipe dalvik, cache. if that doesn't work try flashing new firmware via odin or flash a custom rom from recovery

Freezing at AT&T Logo splash screen during boot.

Every once in a while my phone restarts and freezes at the AT&T Logo splash screen after the Samsung logo. There's no way to get past this besides booting up as if I was about to install a custom rom (holding power, home, and dwn volume) and then canceling and rebooting and even then this only works half the time. Removing battery and rebooting never works. I can't even restart my phone without going through all these loops just to get it on and usable. Anyone know what the issue is? Some people mentioned re installing the kernal. No idea what that means.
The answer, and specific advice, depends in part on what model GS4 you have, what version of the operating system your phone is running, and whether it is stock or custom. I would assume that your phone is running stock (unmodified) firmware since you have no idea what it means to reinstall the kernel. Symptoms like yours can be caused by corrupt firmware, or by hardware issues. The first recommended trouble shooting step would be to enter recovery and perform a wipe data/factory reset. The second and more definitive trouble shooting step would be to reinstall the stock firmware.
If you perform a wipe data/factory reset and the problem goes away, or if you reinstall the stock firmware and the problem goes away, then you know the problem was firmware based and not hardware. If you reinstall the stock firmware and the problem persists, then this is a pretty good indication that the problem is hardware.

boot loop

hi I'm trying to go back from a custom rom to stock,i get to the reboot part and it will only display the Samsung logo over and over any ideas as to how I can stop this I think I need a different bootloader and modem but cant find any.id be grateful for any help thanks.
Did you try factory reset from recovery?

Infinite boot loop of destruction.

So I was going through instagram like every other day when suddenly my phone boots and the boot just looped and looped... Then I made the hard decision of resetting my phone completely. Did cache wipe and data wipe and thought that it would work now but nope. Still in boot loop. Then when I got home I thought that I'm going to Odin and installing the stock ROM from this site. Then I continued to install the ROM, NEE version (since I live in Finland), and it got installed. Booted and looped. Looping and looping and looping right next to me. I tried using Samsung Kies but it was not doing anything when I was in download mode. Tried the emergency thing but nothing popped up to the list that it should have popped on. Don't know what I have done or what my phone has done. I didn't have root at the time it started the looping nor I have now and don't plan to get it again. Didn't have any other recovery than the stock recovery and have never used triangle away. Suggestions?
Using Odin, flash a rom with a pit file. That should repartition the phone and, hopefully, solve the issue.

Phone wont factory reset

Hey today my phone started to turn itself on and off so i tried to factory reset via recovery mode so i did this : wipe data/factory reset then wipe cache partition, but it didnt do anything literally and it keeps resetting... its like i turn it on, unlock my screen, 10 secs and its resetting itself again, i downloaded 5.0.2 firmware and installed it via odin, i didnt have any problems with flashing with odin but it didnt do anything as well and i dont know what to do so i hope you will help me. model g530FZ. I tried using programs to erase everything from my phone but they are **** and wont even find my phone via usb

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