Can I flash my phone with another region firmware? I want to root my huawei phone but i've only found firmwares from another countries, would I have any problem if I flash my phone with any of these firmwares
If the firmware are made for your device you can flash it independently that it was made for a different country.

Take in mind that some countries have specific regulations regarding mobile devices, so some firmwares limit for example the wifi potence, the volume and/or the frequencies that the phone uses to work.