[Note Edge Android Development] xNNism:
Chenxiaolong's DualBootPatcher

A small but well working alternative for Tasssadar's MultiROM...keep in mind that Dualbootpatcher works without flashing a new Kernel

Tested on tbltexx, tbltemo and should work for all other tblte-variants

Because of the very simple porting all Credits and thanks belong to chenxiaolong

His thread you can find here

Visit https://dbp.noobdev.io for further Instructions.

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Instructions: [see also the original thread]

Installation:

Android:

Download the patcher apk and run it. Tap "Patch Zip File" from the navigation drawer and choose the file you want to patch.

Windows (GUI):

Double click DualBootPatcher.exe and choose the file you want to patch.

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After patching the zip file, a new file, like some_rom_dual.zip file will be created. For example, patching ktoonsez's

KT-SGS4-JB4.3-AOSP-TMO-08.28.2013.zip

would create a new

KT-SGS4-JB4.3-AOSP-TMO-08.28.2013_dual.zip

Dualbooting:

Before doing anything, download the Dual Boot Patcher app and the DualBootUtilities.zip from the download section below.

The patcher offers several locations for installing ROMs:

Primary: This is normally used for installing a zip to the primary ROM. It is not required, but is strongly recommended because it has code to prevent the zip from inadvertently affecting other ROMs.

Dual: Dual/Secondary is the first multiboot installation location. It installs to the system partition. This is a good spot for installing a second ROM because it doesn't take any space away from the internal storage.

Multi-slots: There are 3 multislots: multi-slot-1, multi-slot-2, multi-slot-3. These install to the cache partition. This is specifically for devices, like the Galaxy S4, that have a massive cache partition.

Data-slots: There can be an unlimited number of data slots. These install to the data partition and eat up space on the internal storage. This is useful for devices where the system partition is nearly full and the cache partition is tiny. These slots are named "data-slot-[id]", where "id" is something you provide in the app.

Extsd-slots: There can be an unlimited number of extsd slots. These install to the external SD card, which is useful as it keeps the ROMs off of the internal storage. Note that the ROM's data files are still stored on the data partition.

With that said, let's get to the "how to"!

First, boot into your primary ROM and install the Dual Boot Patcher app

Open the app and go to "Roms" in the navigation drawer. It will ask if you want to set the kernel. Make sure that you do.

Go to "Patch zip file" in the navigation drawer and patch the ROM or zip you want to install. You can select one of the installation locations described above.

There are two ways of flashing the patched zip file. You can either flash it normally from recovery or flash it using the in-app flashing feature. Both methods are explained below.

Flashing from recovery

To flash from recovery, just flash the patched zip file like you would for any other zip. Nice and simple.

In-app flashing

To use in-app flashing, go to "Roms" in the navigation drawer, tap the floating button on the bottom right, and add the zips you want to install. You can queue multiple zips and they will all be flashed in one go. Once you've added all the zips you want to flash, click the check mark in the action bar and they will be flashed right away.

A normal backup from recovery will backup every ROM. If you would like to back up ROMs individually, please see [MENTION=3145598]rlorange[/MENTION]'s awesome tool: http://xdaforums.com/show....php?t=2491299

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Download: https://dbp.noobdev.io/downloads

Source: https://github.com/chenxiaolong/DualBootPatcher​