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I want to be able to switch from CM7 to CM9 and vice versa without losing my apps and data everytime. Is it possible to make a dualboot?

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Making a dual boot is possible, there's a nice app for that end available from Google Play Store.

Boot Manager Pro (2,17€) and the Boot Manager Lite (free), both from Init 2 Winit Apps.

Boot Manager is Android's first multi-boot application. It allows you to install boot ROMs from your sdcard and boot between then with just a reboot. The application acts as your recovery for your sdcard slots. Install your kernels, themes, and ROMs all through the app and use your normal recovery for your phone ROM only.

Boot Manager Loading Boot Manager ROM selection Boot Manager Settings

Unfortunately, I haven't found any supporting information if this will or will not share apps between ROMs, but at the very least it solves the dual boot problem.

Ps:
Since apps when installed on the SDcard still leave a portion of their code on the main installation directory of the current ROM, it doesn't seen possible to have apps shared across different ROMs.

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I'll try this now! – Christian Sep 8 '12 at 13:40
This actually soft bricked my phone, I had to flash it again with CM7, so I'll just deal with one ROM :) – Christian Sep 10 '12 at 18:09
@ChristianNikkanen Consider also emailing the developer and let him know about your device, in order to have him providing better support in future releases. – Zuul Sep 10 '12 at 18:16

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