I have an OCTAGON SF4008UHD device. I repackaged a new image, but I did not know what I did. The important thing is when I insert the USB and turn on the device from the back, it gives me in the interface B V 1.19 .... Then directly rootfilelsystem, and immediately after the update is complete, it booying .... Then nothing happens. Anything that does not take off on the new image, where is the problem, may God bless you, my brother