In step 21 is written "The front panel comes off without too much additional trouble". That is wrong for the iPhone 4 that I just took apart. The front panel is glued to the steel body very strong. There is no way to take these two things apart without extra tools like a hair dryer or heat gun to soften the adhesive. How do you explain that?

I was able to remove the battery after applying the iOpener twice for about 10 minutes. I pulled at the plastic tab and used the plastic opening toll together. The battery lifted while applying permanent strong force.