I stumbled upon my neighbor who is a car mechanic. He suggested that we should try with a torx head, so I'll stop by his shop next week and give it a try.
One more thing, should I unscrew the bottom bolt completely before trying to undo the upper problematic one? I'm asking this because I've read many times that untightening one bolt actually increases the load on the other one.
I stumbled upon my neighbor who is a car mechanic. He suggested that we should try with a torx head, so I'll stop by his shop next week and give it a try.
One more thing, should I unscrew the bottom bolt completely before trying to undo the upper problematic one? I'm asking this because I've read many times that untightening one bolt actually increases the load on the other one.