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[Q] LG G2 Sprint stuck in bootloop, no recovery please help

Hey guys.
I'm new in the Android world and bought an LG G2 back in november.
I had originally intended to custom install cyanogenmod or KitKat 4.4 to replace stock rom, but I couldn't find a way to install a custom recovery, and was only able to root my device via Kingo Android Root.
A while later I saw an update that popped up, and not knowing any better I clicked install. It was about 114MB. That was about 3 days ago, and my LG G2 has been stuck in a bootloop ever since.
When I try to turn it on the LG logo shows up, then it says "secure booting error"and "Cause: boot certification verify" on the top left corner of the screen in white text.
I tried doing a hard reset, but that didn't work. I don't have a custom recovery so that I can clear the cache and data or something. So pretty much I have a bootlooped phone with no custom recovery, I can't do a hard reset, and it's Sprint and everything's new so it's harder to find a fix.
Does anyone here know of a way I can fix this? It would be much appreciated.
Thanks in advance

[Completed] [Q] My android phone stucks on boot logo!

Hey,
I have a local brand android phone and im using custom rom in it. Rom is working good for months but today when i install font on my phone via ROM TOOLBOX PRO then restarted it, it's just showing boot logo and nothing happens after that.
I tried all the tricks, removes battery waited 30s then started it but still no results. And it show recovery mode in chinese language as showing in picture. It has not an option for wipe data or reset the phone.
Help me out please what should i do now..

Hi,
We need to know your device make and model number to see if we can find anything on XDA to help. ?
Thanks!

[Completed] [Q] How a system/media should look

Hey, i recently changed my moto x 2014 5.1 LP bootanimation. It didnt work, and i just got the default one zip back. After I tried installing another. I Flashed throught TWRP and gave me bootloop. Restored a backup i did before flashing, and the device "works". If i reboot normally, it gets stuck into M logo, at the end of animation. If I hard reset, boots, but have to load all the 250 apps and takes around 1 hour. Now I installed Xposed module Cool Tools, soft reseted to enable and it STUCK in the M logo, like before, but hard reset dont work.
When I looked into system/media to get the default animation back, there were a "bootanimation-encripeted.zip" bootanimation.zip and another folder, with motorola logo inside and a nomedia file. Any of those could possibly make my device stuck in boot?

Hi, I see you're a regular user of XDA Assist. SEE Assist should not be the place you constantly go for help. Our mission is to point new users to the best place to continuously get help. We are not a help desk. Please ask your questions in your device specific forum here, http://forum.xda-developers.com/moto-x-2014. I'm going to close this thread.

Moto G stuck on bootloop after underclock :(

Hi people
I recently rooted my 1st gen moto g and installed TWRP recovery. The phone is out of warranty. I did this with the help of a friend.
Today another friend gave me this app - no frills CPU control and I tried to do the 'battery saving' thing. Nothing happened initially. Then I decided to create a backup using TWRP so I did. But after backup, when I'm trying to reboot, it isn't rebooting. It's stuck at the motorola sign, and isn't even booting in recovery. It just shows the Teamwin blue color thing, and then again gets stuck on the motorola icon. Can't even factory reset. Now I'm a newbie, whatever I did was with a friend before.
Now my dads pissed because this is the second time somethings wrong happened with my phone and the first time I could get it done as it was in warranty. What now? Help will be greatly appreciated

[Completed] LG G2 Stuck at Logo after using Fontster

Ok that's what happened.
I have a LG G2 D806 with Android 4.4.2 downloaded from lg-phone-firmware.
I was using the phone for 2 months without any problem. Everything went perfect.
Today I tried to change the system fonts with Fontster app, changed it once, asked me to reboot, and everything ok, and when i installed a second one and rebooted the phone, it got stuck at lg boot logo with the notification led blinking for like 5 or 10 minutes with no results.
I even cannot enter in recovery mode or i tried or made something wrong i dont know.
Please help me i dont know what to do and probably the best way will be flashing another rom or something and dont know how to do it and dont want to do it.
Waiting for your help guys!!