Huawei E5786Bs-32a firmware problem?

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New member
Sep 19, 2017

I have Huawei E5786Bs-32a. Changed firmware from telenor brand to 21.313.17.00.00 (without brand). Unfortunatelly it was firmware to E5786s-32a.
Now 4G range is very low. Similar router E5577 with simcard of the same operator has max 4G range.

Is this firmware could be a problem? I didn't noticed if low 4G range was before firmware change.
I have searched for proper firmware and Web UI to download but without effect. Even Huawei service in Poland can't help.
Can someone help me?

Sorry for my English.