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Samsung Grand Prime SM-G530M problems with 4G/LTE signal


AC Question

Hi everyone, my phone, which is a Samsung Galaxy Grand Prime SM-G530M, has almost 2 years old.
Over a period of one and a half years the phone detected the 4G / LTE signal without any problem.
In the last december the operating system was upgraded, security update, but did not change the version of android.
From that moment, always detects the signal E, and sometimes the signal H / H +. But the 4G signal never again.
The phone never fell on the floor, never fell into the water, the SIM chip works on 4G / LTE on other phones.
After a month with this problem, I root the phone to have more options for repair.
Please can anyone help me with this problem?

thank you very much to all.