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I've read Recovering from forgotten lock pattern which states that there is an option to disable the lock using my Google account information. However I did not noticed such an option when I entered my password five times wrong. (Although there was also a 20s or 30s delay to complicate brute force attacks.) I use Android 4.0.3 on a Asus Transformer Prime TF201.

Would factory reset work?

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Why do you think, factory reset may not work? It wipes out every custom configurations.. –  Sachin Shekhar Mar 22 '12 at 10:02
    
As the device is locked I did not know if I could employ a factory reset. I just guess that there is a key-combination like: volume down + power button or something similar.. I was not sure. –  math Mar 22 '12 at 13:04
    
Yes.. you can factory reset from recovery mode. How to enter this mode varies as per devices. –  Sachin Shekhar Mar 22 '12 at 13:19
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2 Answers

up vote 7 down vote accepted

Install Screen Lock Bypass (free) from web interface of Play Store. It'll not reset/remove your PIN, but unlock your device on each reboot. If you want to permanently reset/remove PIN, you'll have to purchase its pro version.

In the last, you can always factory reset your device if these apps are not working for you. Factory reset wipes out all custom configurations including PIN/Security Lock.

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So an unauthorized person only needs to reboot, right? –  math Mar 22 '12 at 13:05
    
This app (free) is for one time use in case you're out of option and you need your data back. –  Sachin Shekhar Mar 22 '12 at 13:21
    
So, Use pro version which could reset PIN. Then, setup a new PIN and device security will become as before. –  Sachin Shekhar Mar 22 '12 at 13:24
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After that you can uninstall the app.. –  Sachin Shekhar Mar 22 '12 at 13:27
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Do it from web interface of Play Store… from PC. Google will push that app to your device and install it. –  Sachin Shekhar Mar 22 '12 at 13:39
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I don't know if you were able to unlock you phone, but what I would like to suggest is once you are able to unlock your phone then get a great app vipsha2 - Remote Phone Screen Lock from Google play. This app has helped me a lot and its free. We just need to send an sms from other phone and we can lock or unlock our phone.

Edit by Izzy:

As the following screenshot shows, you set up an "attention word", which then has to be send by SMS to trigger the Lock/Unlock. Not sure where the password comes into play, as I do not use this app.

Configure password Unlock SMS

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Would you mind to share a link to this app? –  ce4 Nov 8 '12 at 15:53
    
I was so free to add the link ;) –  Izzy Nov 8 '12 at 22:48
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protected by eldarerathis May 26 '13 at 16:40

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