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Help Help! S4 i9505 constantly bootlooping and crashing

Hi guys. I've been a Samsung user for a long time, having had Galaxy S right through to my current S4 i9505. I've experimented at times with different ROMs and don't have a problem fiddling with my devices.

My current problem is doing my head in, any assistance would be greatly appreciated. After updating my stock firmware with Android 4.3 I've experienced nightmares with regard to battery drain, constant crashes and occasional boot looping. In many cases, I was only able to get my phone to stay running after powering on whilst phone was connected to an active USB cable, regardless of how much battery charge I had, it does it when fully charged.

In an act of desperation, I've rooted my phone, installed a new ROM (I9505XXUFNA1) and reconfigured. I've also installed TWRP and have run thorough cache wipes, including the dalvik cache. I've tried safely removing and replacing my SD card, uninstalled superfluous applications, even run a couple of factory resets. I've followed every piece of advice I can find on forums to a tee, and the problem is still persisting. This is where my technical knowledge ends, so any assistance or suggestion would be greatly appreciated. I used to love this phone, now it's nothing but an expensive paperweight.

Thanks :)
Ash
 
Your battery is dead. I had a same problem and it went away with changing the battery. You can see it if it is a bit round, as like "expanded"
 
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