Help Update Android TV

Hello to all I tell them that I’m using the google translator.

I have a tv android RK2918 Android TV Box with 4x USB. and following the tutorials forum I updated the firmware.
The team works but does not lift the HDMI only works for RCA.
It is an old team with 2.xx Androi9d. Alguin can help me to update it or to see how to operate the HDMI again.
Thank you

Hi there,
Shut down the computer. Turn off the monitor or TV.
Connect an HDMI cable to the computer and to the display.
Turn on the display, and select the HDMI input as the input source to view.
Turn on the computer.

Hi Mate!
Android TV can easily update by following 4 easy steps
1.Press the HOME button on your remote control.
2.Then, select Help in the Settings shelf.
3.In the Help menu, scroll down until you find System software update - Update the TV system software under System.
4.Then, either use the Check for a system software update function, or restore the Automatic software download setting to ON.
I hope this will help you.