Guys, before any dangerous or irreversible operation, remember to try to remove ONLY the battery for few minutes! In my case it worked, I think there is some integrated protection to protect the fuse.

Ciao! Or, as me, you have to buy a molibdenum wire to separate it heating with a heat gun and a tube of loca glue. It's hard to do.

Well, I'll try the contact cleaner! The last time on an Alcatel one touch I used the olive oil and it worked a bit slowly but very well. Now it smells like salad but it's ok.