So I just tested out the removal of the Dell Quickset utility and also updating the BIOS to A14 and the problem still persists. One thing I did notice though that could narrow the issue is that updating the BIOS did temporarily bring back the boost mode, similar to as if I had removed the battery, however once the power cable was again removed whilst powered on and then reinserted, the laptop had the same boost bug issue again. So there must be some persistent main battery powered memory in the BIOS that is separate to the button battery memory.
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