Symptoms: Plug in TV... turn on via remote control... Samsung logo showing up... few seconds of black screen... restart by itself... and continues to restart on and on...
Solution: open back cover of TV, locate your motherboard, locate on your motherboard the eeprom connection holes(see attached picture - on left and upper part of motherboard). Install jumper like a small wire into holes named eeprom_gnd and eeprom_sda, no need to solder it because it is necessary to remove it later. After you successfully install jumper, plug in your TV and don't switch on normally. Press on remote control the sequence Info-Menu-Mute-Power and on this time TV will switch on into Service Menu directly from where you can make a factory reset or whatever you want, after you see that Service Menu show up just remove your jumper from motherboard and apply a Factory ( in my case).
Notice: You will not see the normal message "Please go into service mode and setup below options" because this message is coming if you turn on TV just by pressing power button on remote control, and you will not be able later on after you shut down TV and switch on back to get into Service Menu will get bricked again.
Good luck and thank you very much for all information from this forum, wiki pages, etc.