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[Q] Why IMEI is different when installed android 4.1.1 than installed 4.4.2 topic






I'm very sorry for my bad english...

I bought a new galaxy note 2 N7100, it comes with android 4.1.1
When I try to upgrade to 4.4.2 via 'Software updates' menu I receive a message 'your device has been modified software updates are not available'.
At the 'Download Mode' screen I see CURRENT BINARY: CUSTOM & SYSTEM STATUS: CUSTOM.
So I installed a Stock ROM 4.4.2 from here: sammobile.com/firmwares/download/38904/N7100XXUFNJ1_N7100OJKFNJ1_ILO.zip/
Now when I try update via 'Software updates' menu I receive a message 'Connecting to server > the latest updates have already been installed'
At the 'Download Mode' screen I see CURRENT BINARY: Samsung Official & SYSTEM STATUS: Official
Fantastic!
But now the IMEI has been changed (normal valid number no generic) and the 3G network works well.
I want return the phone back to the seller therefore I need to restore the previous version 4.1.1
So I did 'Reset to factory' and I installed a Stock ROM 4.1.1 from here: sammobile.com/firmwares/download/7562/N7100XXALIH_N7100OJKALIH_ILO.zip/
After the installation had occurred magic! the original IMEI was restored!
When I try to upgrade to 4.4.2 via 'Software updates' menu I receive again the message 'your device has been modified software updates are not available'.
At the 'Download Mode' screen I see again CURRENT BINARY: CUSTOM & SYSTEM STATUS: CUSTOM.
Now I don't want return the phone back..
I upgraded to the latest version via Samsung Kies and after upgrading I see that the IMEI was changed again, now it's the same number as the previous time that installed 4.4.2

It is very strange this story.

Why after original Stock ROM 4.1.1 installation the 'Current Binary' and 'System Status' are 'Custom' and why can not update via 'Software Update' ?

Why when the Stock ROM 4.4.2 is installed the phone has X IMEI and when the Stock ROM 4.1.1 is installed the phone has Y IMEI (X is always the same Y is also always the same but X and Y are different, also they both are valid - 3G works well) ?

I only want install the latest official ROM - Android 4.4.2 and keep the original IMEI
Someone can help me how to do this?

Thanks very much in advance.






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