Failed OTA update for Oxygen OS 3.2.1 on OnePlus 3

Hi all, I have just recently purchased a new OnePlus 3 from one of the distributors listed under OnePlus's website. I've been waiting for the 3.2.1 OTA update for a while and its finally in my region. However after it finishes downloading and I press install, the phone reboots and after a while it would appear a screen which says "Installation Failed" with nothing else but a Reboot button. Can anyone shed any light on this potential problem or is it isolated to just my device? Is it possible for me to completely reinstall OxygenOS on the phone again? (wipe the phone and reinstall android + oxygen's). Also when I bought the device and first booted it, I noticed that there was some apps already installed( apart from stock google ones). These looked like malware to me and it doesn't allow me to uninstall them(from app drawer or from settings), is there anyway i can uninstall them as well?

Thanks in advance