It was probably put on before the lacquer was dry. The options are to use heat energy, mechanical energy, or chemical energy.
Try heating the whole thing up a little with a hair dryer, or VERY CAREFULLY with a heat gun, and see if it loosens. There is a chance that you could mar the finish if too much heat is applied.
The danger with mechanical force is scratching the finish. You could try to use a rubber mallet to shift it. Apply the force sideways to move it across the back of the guitar. You might be able to get some mechanical leverage through the holes for the screws, but the countersink leaves little shelf for lateral contact.
Finally, you could apply a solvent, but it would strip the finish. This, of course, would require you spend the time and money to re-finish.
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