It really helped, thanks a lot!
I suggest you to attach such info to main post because I found many questions about unrooting TVs and many solutions widespreaded on whole forum
Hi there! I installed SamyGO on my F6640 with MST method. However, would like to completely remove it. What I did was to remove SamyGO widget from Smart Hub, factory reset TV and reset Smart Hub. Unfortunately, it looks like exploit isn't removed completely - virtual storage appears under source but...