Hi..... I have the kdl-65w859c android tv and after the the latest software update  the home button doesn't work

so I can't access er...... well anything. I have noticed several others have a had similar problems, and noted that one member said that he did a restore to factory settings which worked for him. So my question is how to do a factory restore, and if this does't work for me are any other suggestions regarding this problem from anyone in the community. Thanx in advance for any help.