From FP: Generally speaking, the FP tune can be left installed during OTA updates. The truck does not need to be returned to stock.
In the event the OTA update is directed toward the ECU, the OTA update may not install or may show an error during the attempt IF the OTA is directly related to the files the tune changes.
1. You’ll either be prompted to return to stock, install the update, then reflash
Or
2. The OTA update may overwrite the FP tune. You’ll just need to reinstall/reflash the tune to the truck.
No known complications from OTA update installations or attempts. OTA updates have not “bricked” any ECUs flashed with FP tunes.