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Can we summarize all the threads ?

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So I have the 4.0.4 ICS.


I don't know all the terms like CFW and NAND and blahblah and I don't really have the time to read 300 pages of replies...


I want to update to the 4.1.2 or 4.2 JB


I did root the phone on 4.0.4, but it was a semi successful root, as superuser and overclocking worked fine, but things such as "change the extension of system files" would not work.


I now get the "This device is not allowed to update" error when I try the official airborne update.


I also need the WIFI G3 and GPS.


What can I do ? I tried to flash the zip files from SD but I constantly get the ro.product.device error.


Most links people are refering to are dead.


How do I flash a firmware ? Can't I just flash the official JB firmware ? 

How do I unroot my phone so that I can make the official update ? 


Please help

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