open research download
load correct pac file
click download button
hol vol up+vol down and insert usb cable

done

tested firmware https://drive.google.com/uc?id=0B_AjfgaF5sHEbkRZMGZmTTZGUDg&export=download
load correct pac file
click download button
hol vol up+vol down and insert usb cable

done

tested firmware https://drive.google.com/uc?id=0B_AjfgaF5sHEbkRZMGZmTTZGUDg&export=download