Spray it down with penetrating oil and let it set overnight before trying to use an easy out. It might help.
I have several Stihl products. They are OK, but not that much better, if any, than other top of the line products from other companies. Like everyone else, their products are getting more cheaply built all the time. I get a kick out of how Stihl's latest ad seems to try to make a quality point to say their product is not sold at Lowes or Home Depot. As if where who the retailer is establishes the quality? It probably has more to do with Lowes and Home Depot tried unsuccessfully to get a volume discount, or something similar.