The guys over at
KGDTeam • Ver Tema - Recovery por RS232 los Mygica ATV300 - ATV1000 - ATV2000
have devloped a technique to unbrick a thw atv 300, 1000 and 2000.
Basically it is reprograming or reviving uboot and some other stuff via the unit's ttl interface.
I am in the process of trying to unbrick an ATV 1000 clone
Now the problem is that it requires a RS232 to ttl converter to get the info from a PC to the TV Box. I got one from China. The next problem is the connectors for the ttl interface on the TV Box. They are too small for the ones supplied with the RS 232 to TTL converter. It can accommodate three of the four connectors (Rx, Tx and VCC) and I have found a common earth point for the fourth.
The next problem is a PC with an RS232 output. They are not common on newer PCs. I have two old laptops with RS232 outputs but one would not boot and the other only has a 3.5" floppy and no USB port. I do not have a way of transferring the program to it as no other computer I have operational has a a 3.5" floppy drive.
As a result I am currently building up a new very basic PC from bits and pieces I have laying around.
Then I think I have to install and learn a bit of Linux to be able to use it.
And finally the instructions are in Spanish and require some deep thought when interpreting the English translation.
I would love to trade experiences with anyone else trying to unbrick their units.