It's either a conflict with packages installed from OpenRepos, but as you've reset your phone, it seems more likely that it's a strange bug that's been there since the very beginning and was never fixed. Out of all updates, I've only ever been able to install three of them the official way. All of the others I've had to install as such:

• Enable developer mode
• Set a password
• Open terminal
• Enter "devel-su", followed by your password
• Enter "ssu re re.lease.num.ber (where re.lease.num.ber is something like 3.0.1.11, the release you want to update to)
• Enter "pkcon refresh" (this is not mandatory, but you'll probably run into another issue with missing or conflicting packages at some point, which this helps you avoid/resolve)
• Enter "version --dup"
• Wait until it's finished, then reboot your device
• That's it!