[Lenovo A7000 ROMs, Kernels, Recoveries, & Other De] Rohan Taneja:
Totally based-off project MultiBoot by [MENTION=4277844]chenxiaolong[/MENTION] (the real MVP) has now been ported to Lenovo A7000-a. Check the Official Thread

Keeping all details short, I would like to warn people that neither Me nor the original developer is responsible for any damage that took place to your device.

Disclaimer:

/*
* Your warranty is now not void.
*
* We are not responsible for bricked devices, dead SD cards, thermonuclear
* war, or you getting fired because the alarm app failed. Please do some
* research if you have any concerns about features included in this ROM
* before flashing it! YOU are choosing to make these modifications, and if
* you point the finger at us for messing up your device, we will laugh at you.
*
*/

How to use the patcher

(taken from original-dev thread)

Android

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

--------

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

DareAOSP-N.zip

would create a new

DareAOSP-N_dual.zip

Instructions for dual booting

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

.

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/showthread.php?t=2491299

How do I...?

Switch the ROM if something doesn't work properly?

You can flash the DualBootUtilities zip from recovery. It will provide a menu interface that allows switching to the various ROMs.

If you have TWRP, you can also switch manually by tapping Install -> Images (bottom right) -> Go to /sdcard/MultiBoot/[Your ROM]/ -> flash boot.img.​

Wipe /cache, /data, /system, or dalvik-cache?

The easiest way is to do it from the app while booted in another ROM. Just go to "Roms" in the navigation drawer, tap the 3 dots options menu for the ROM you want to wipe, and tap "Wipe ROM".

Alternatively, flash the DualBootUtilities zip from recovery, which will also allow you to wipe a ROM.

NOTE: Don't use the recovery's built-in wiping abilities as that may delete non-primary ROMs!​

Update the primary ROM?

Patch the zip for primary and flash it. The "primary" installation target is designed so that other ROMs won't be affected when you want to flash something for the primary ROM.​

Update a non-primary ROM?

Patch and flash the zip exactly like how you did it the first time.​

Flash a mod or custom kernel for the primary ROM?

Patch it for primary before flashing. If the zip does not wipe /cache, it is also safe to flash it directly.​

Flash a mod or custom kernel for a non-primary ROM?

Just patch and flash it :)​

Downloads:

DualBootPatcher (Supported Devices)

DualBootApp (switch ROM when booted to Primary/Secondary ROM)

Source Code: GitHub Pull Request