So I just TWRPly purged everything then tried again and it worked, windows 0.1.21
You may not believe this yet this my first non-feature phone
Time to embark on new journey eh?

So I just TWRPly purged everything then tried again and it worked, windows 0.1.21
You may not believe this yet this my first non-feature phone
Time to embark on new journey eh?

@advocatux
my apologies
https://hastebin.com/cejifojoci.json

Ahhh, forgot the log https://share.riseup.net/901d0efd-c2df-4f34-9680-a8df5dbaf692
Don't tell me it's due to port 5038?
And the recovery log says "update faled"

The title says it. I boot into Oneplus logo now. After "Success!" promt and "installing updates"(for about 3 minutes) I boot into Android bootloop. Can still boot into UBports recovery and stock fastboot though.
At this point I think maybe some shady "root assistant" thingy shall be hold responsible, my device come from China and all that. The reason is after the very first "Success" my device boot straight into "ColorOS" and the root thingy is still there despite I chose wiping the device.
Before you ask, yes, I have tried my luck on Linux(both debian and slackware based), Windows 10, switching UBports Installer versions, 15/16.04, devel/rc/stable, USB ports, cables, laptops. But it ONLY start downloading images on Windows 0.1.21 beta and that doesn't work out for me either.
So, any thought? I am still pretty new to mobile OS in general and will be happy to find out this is a layer 8 issue, and hey, thanks in advance!