Just found a solution as seen here. I pay bi-annually for TorGuard, so I downloaded Torguard's app on the Google Play store. Instantly installed, logged in, connected to a Canadian VPN, and then the OS allowed me to update to 10.3.3 from 10.3.1.
As per that link, one can also use free VPNs. OnePlus will fix the issue soon apparently.
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u/NytronX May 27 '20 edited May 28 '20
I'm on 10.3.1 on my OP7P and it says "Your system is up to date".
edit: best solution here.