hi
first i like to say thanks for this forum, and special to sectroyer and bobsilvio .
I manage to root my Samsung UE65HU8505 , firmware was 1280.8
All working perfect after downgrade firmware to 1150.6 including oscam
I was thinking to writte how i make this to work ( maybe other people find this helpful ).
I swich watchdog off in service menu.( do not play with service menu if you do not know what you are doing )
watchdog off.JPG
I disabled updates on router:
ROUTER disabling uppdates.JPG
updates are disabled now!!!
Idownloaded from the first post :
SamyGO.zip
InstallSamyGO-H.zip
samyext4.zip
unpack all of them and copy samyext4.img to SamyGO. on InstallSamyGO-H I replace on javascript folder the file Main.js with bobsilvio moded file main.js
I copy the two folders ( InstallSamyGO-H and SAMYGO ) on root of 32gb usb 3.0
I Recorded first something on another usb stick and swich off the tv, inserted usb 3.0 and swiched on tv.
Iaccesed my usb 3.0 from the smart hub and the proces was started after 5 seconds without presing any buttons on my remotte control.
after that I just press enter on my remote control:
Samsung UE65HU8505 Rooted.JPG
press exit and reboot tv!
and Bingo!!!!
tv was rooted.
Capture.JPG
I succsesful downgrade firmware from 1280.8 to 1150.6
Samsung UE65HU8505 1150.6.JPG
I installed oscam and THE LIGHT IS ON !!!!!! ( working like a charm )

If you respect all from first post ( posted by sectroyer is working !!!! (otherwise you just craing here that tv is not working no more))
Thanks again to sectroyer and bobsilvio !!!