Database Users

Extract and open boot.img on Android 5.1.1

I have a Galaxy s4 R970, running cm12.1 on Android 5.1.1. And I want to open the boot.img file on my phone (don't have a computer currently) so I can edit the kernel to allow overclocking.
This will be my first attempt editing a kernel, but I need to expand my horizons.
So, the issue I have currently is a PIE error in terminal trying to open the boot.img using unmkbootimg command. (some older utilities) found here (http://forum.xda-developers.com/general/rooting-roms/how-to-guide-extract-boot-img-android-t3114380)
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Although, I DO also have a rooted galaxy s aviator running jb, I would like to try to avoid using it as much as possible.
Any and all help is greatly appreciated!

sm-g530bt and variables

as it would be a safe way to test the variables sm-G530 in the sm-g530bt?
safe and put the SM-G530 alternative it?
how can I make a security copy of the already boot loader that has modified rom him

If it is safe I don't know, but you can try. Some people says the sm-g530h roms works in the sm-g530bt. You can try and tell how it goes.
Do you want a general backup? Root your phone, put TWRP in it, do the backup from recovery and copy it to a secure place. After, you can install the rom. The phones isn't too different, so a terrible brick isn't supposed to occur
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I have need help to update my device

HELLO
First, these My device specifications
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Secondly, this is the recovery
The beginning I do not have any experience I tried to download the updated Cyanogen Mod 13 (6.0) with the recovery wholly followed instructions and got cyanogen
fastboot and adb appeared to me a problem when I try to load recovery by computer by fastboot
When I try to download or root of the phone Reload this message appears
And I had tried to root updated using apps
Root Checker
SuperSU
Root Tool Pr
TWRP Manager
OR King Root So what is the problem? And what to do ?

Install xposed framework on lg k10 mtk

Hi, today i'll show you how to install Xposed Framework in the easiest way, without bricking the phone.
things needed:
Root
Xposed installer
WARNING!
I'm in no way responsible for whatever happens to your device if things go wrong.*
Your device is your responsibility, proceed with caution and only if you know what you're doing.
Okay, let's start now
1.flash the v10e firmware. (before 1 feb) (the newer firmware doesn't work )
2. Install xposed installer and open it.
3.click on install/update and select install (don't select install via recovery)
4.grant root access
5.done
Sorry for my bad English.
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Sent from my LG-K430 using XDA-Developers Legacy app

My S3 is stuck in recovery mode and says no command.

Hello. I bought it to root it and less than a day after rooting I get this. When I click reboot system now it just says error then turns off and back on to the same screen. have tried every option including factory reset with no luck. Please help. Thanks in advance.
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if you have a pc, you can flash twrp and try custom roms,I can help about it. İf you want to use android 4.4.4 (stock) use odin and flash it.If you still have hope after 1 year