Three UK Software, possible to flash newer? - Huawei Mate 10 Questions & Answers

Hi,
I'm new to Huawei devices after years with Samsungs so sorry if this is a bit of a noob question. I've searched the forum and not found a definitive answer.
My Mate 10 Pro is Three branded, purchased from Three and running firmware 124. The question is: Can I flash newer versions of firmware to get the latest fixes/security patches but keep features such as native wifi calling?
If it is possible how do I do it?
Thank you.

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