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How to install Custom ROMs to Android

One of the main reasons many people root their phones is to install custom ROMs. These are replacements for the operating system on the devices, and are often updated versions of Android that the manufacturers haven’t made available. The most famous ROMs are Cyanogenmod and Paranoid Android, both of which offer excellent alternatives to the bloat heavy offerings of many mainstream Android flavors. Installing a custom ROM is another risky venture, which should again only be undertaken with the knowledge that problems could occur. Non optimized ROMs could cause hardware issues, drain the battery quicker, and mean some apps don’t work properly anymore.  Then of course there’s that old ‘brick’ issue. 
Usually before you install a custom ROM you’ll need to create a Custom Recovery. This will allow the device to make a backup of your system, install ROMs, and provide a way to get going again if things go wrong. The most common types are Standard Recovery (this is a part of every Android phone), ClockworkMod (CWM) and Team Win Recovery Project (TWRP).
Apps such as TWRP Manager, ROM Installer and ROM Manager have the ability to create these Custom Recovery features, and they also provide a way of downloading ROMs and installing them on your device. As flashing a custom ROM can be a fairly tricky business, you will certainly need to visit sites like XDA Developers or the excellent Cyanogenmod, where you can search for the detailed steps that you will need to follow in order to flash the Custom ROM. It’s extremely important that you follow the steps to the letter, and read them several times before you begin. Otherwise you can quickly end up with an expensive paperweight on your desk.
We used TWRP Manager to install a dedicated ROM on our LG G3 that we downloaded from the CyanogenMod site.
The sequence for installing custom ROMs is essentially this

  • Root your phone
  • Find the version of the ROM for your specific device and download it to your phone
  • Download TWRP Manager or another ROM manager app
  • Use the ROM manager to create a Custom Recovery
  • Backup your existing ROM and data
  • Use the ROM manager to boot into recovery mode
  • Wipe the existing ROM
  • Flash the new ROM
  • Reboot your device

Creating a backup of your existing ROM means that if you don’t like the new one you install, or you want to put your phone back to its original state, you can use a ROM manager to restore the backup.
One thing to consider is that CyanogenMod and other ROMs don’t come with the Google Play Store as standard, and you’ll need to visit the CyanogenMod or relevant ROM builder’s site to find instructions for installing the service. It isn't difficult, certainly not now that you've gotten this far, but it still involves downloading software and using the Recovery mode to install it on your system.
Return to factory settings
If you’ve finished experimenting with ROMs and Root access, then there is a simple was to take your phone back to the way it was when you began. Open up the SuperSU app, go to Settings and then select the Full Unroot option. Hopefully now your device will return to its unrooted status.
If this doesn’t work then you can still unroot your phone, but it will involve researching your particular handset and maybe asking a few questions on the XDA Developers forums. They’re a friendly bunch though, so it’s not a bad way to spend some time
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Location: Lahore, Pakistan

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