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I followed Nikolay Elenkov's method of unpacking backup.ab.

Is it possible to get data/data/ from backup.ab?

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When I saw the title on the front page, I was going to suggest you read Nikolay's blog on the subject. His stuff is always good. He's got a book coming out too: Android Security Internals. – jww Sep 24 '14 at 18:47

I found a bypass to this problem. Just do a full adb backup including all app data, apk and system data. Then root the phone and restore everything from backup. Then I would be able to access data/data/ using Root Explorer on my phone.

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To extract it in an easier way, take a look at How do you extract an App's data from a full backup made through “adb backup”?. Multiple options available :) Your method was not mentioned there -- and brings us to one more: you could have used the Android Emulator to restore to... – Izzy Mar 29 '13 at 18:22

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