OnePlus 3 & 3T | Upgrading Modem Firmware to 9.0.2 or Newer
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The modem firmware on a smartphone usually stays the same throughout a major version of Android. An OEM could decide to make some fixes to squash bugs or improve performance/stability, but the foundation of how that modem is coded is the same. This isn't the case when you compare two different versions of Android though.
Each major version of Android that Google releases make changes that OEMs have to adapt to.
Upgrading the OnePlus 3 and OnePlus 3T to the latest version of LineageOS is going to require that you have the latest version of the modem firmware. Trying to update from 15.x to 16.0 of LineageOS will result in an error telling you it needs version 9.0.2 or newer, and today I will be showing you how to perform that upgrade.