Update.
I want to notify, that I am still working on the project. In general I am learning on boot/recovery process of Amlogic Devices. I will continue because what I learn should apply not only to GTCOMBO, but to most E2 Arm devices. So I am learning anyway.
Now my GTCOMBO purchase is in trouble. So I do not know when I will be receiving it.
There are a few obstacles that are making this project hard or destine to fail.
The SAT Hack community has been for long here. But to survive, hackers need to have as much freedom to modify their stuff so that it finally can obtain positives results. So Lock bootloaders or Force updated on devices are the enemy of a hacker. If a hacker find that a new firmware not longer work, he then try to rollback to the previous. But if a Lock bootloader prevent rollback, it is then endgame. There is more to it but lets try to make it short. Now USA intelligence N S A, long intervening in Phone OS development to ensure that commerce on phones is safe. And Android/Iphone user got custom to force updates. Now an Android Satellite receiver can NOT be like phones. As I explain your TV viewing gets on jeopardy.
It seems at the moment that GTMEDIA is treating its Android Satellite receivers like Phones with force updates. I do not own GTMEDIA to be sure that possible the phone bootloader may be lock too. If we can not install what we want as hackers on the Receiver, then this device looses quickly its potential as a platform.