Solved! If someone needs tips for clean install of ubuntu touch, you can contact me.
Edit: Only thing what is solved is how to reinstall os. Still have issues with carrier in Finland.
I bought Meizu Pro 5 Ubuntu Edition about month ago from jd.com. Device was shipped with OTA-10.2 and everything was working fine. Some little problems first when i was calling and my number wasn't showing. I got that fixed by disabling "private number" from my carrier services.
Now the problem is that when i upgraded to OTA-11, i'm losing 2G/3G connecting randomly and quite often. Signal indicator shows most of the time at least half signal both 2G and 3G, but i cannot receive calls. And when i realize that i cannot receive calls and try to call someone, signal just drops down and i cannot make a call. Sometimes this gets fixed for sometime when i just reboot, but not every time.
I have been checking 2G/3G data connections and realized that also data connections does that. - When i choose data connection "only 2G" or "2G/3G" and start using it, signal drops down or data transfer speeds are incredible slow. Looks like 4G is working fine.
At the same time when I upgraded to OTA-11, i installed Unity tweak tool from Openstore to try out what i can do with that. So UT-tool can also be the cause of this problem. I have tried phones own "recover" multiple times, but i don't think that will wipe all the data.
I guess the best solution is that somehow i have to wipe all the data, including system data from my device and reinstall the OS. I think i wanna try to get OTA-10.2 back and see if there is this kind of issues and then upgrade to OTA-11 and see how it works.
Does anyone know "easy" way to do this? I'm quite new with Linux systems... Or some other solution?
Some other information: My carrier Sonera Finland. Done some Googling and i'm quite sure my device is "international version", unrooted, unlocked