Never knew 3.4.2 exists, thought it was 3.2.4, then 3.5.0.
sorry folks, I had log in error, so I could not reply earlier. 3.2.4 is correct, but it seems that we are not able to install this via OTA, probably due to some restriction from OnePlus end. I m not sure how, but the full 503 MB seems to be downloaded into the memory at this point and failure to install during reboot.
I am watching out (on OP forum) for the new official 3.5.0 OTA to be made ready. The current Oxygen 3.1.3 seems to be working fine, so I won't sideload the community build until it is ready. anyway, I don't know what's missing from 3.1.3 at this point, so I will just bear with it for now ...