guitoscan

It is widely known that often they reuse those chips which are not up to the specs. They pick parts from the trash and assemble the tvboxes.
 
Sure you are not the only one, but helping solve the problem without the board in my lab for tests is difficult anyway.

@guitoscan
 
Welcome in the club 🙃 
rk322x are often " assembled" with the first avaible piece of chip laying around in producer factory.
 
We have spent now more than 3 years reading of rkdevelootools android tools factory tools and so on and yet no clue with some boards we dont own

5v, no less no more. Anything else will probably destroy the board.
 
Unfortunately I don't think you can do anything with maskrom mode; I don't have such a board so I absolutely don't know what is going on with that particular board. All we can do is guessing 🤷‍♂️
 
rkdeveloptool via maskrom mode if you have a full-image backup, or AndroidTool and the upgrade images for your board you can find on the internet. You have to find the right one though, which can be a time consuming task.
 
Well, tvboxes are not really serious things. If you really need the board to do something minimally serious, it is better to go with a proper SBC and even better a proper SBC officially supported by armbian.
if you want to toy around, tvboxes can be funny but beware they are often assembled with scrap parts stick together with hacks, especially the cheapest ones, and supporting them is quite painful.