Why isn't my mobile data working on my Samsung Galaxy S4 after the Lollipop update?

A

AC Question

Mobile data not working on Samsung Galaxy S4 after lollipop update

Hi guys!
I live in Bangladesh and my GT-I9505 was brought from UK. Few days ago I flashed Singtel 5.0.1 update and since then my mobile data won't work. I can enable it but there is no signal whatsoever. Everything else is working fine so I'm wondering if I flash EE 5.0.1 firmware then will my mobile data start working again?
Secondly, exactly how do I flash the firmware through odin? Is there any chance of bricking my device?
 

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