X10 MAX PLUS bricked? help needed

[mrday]

Hello,
I bought an x10 max + tv box for a friend, after he installed some applications to watch online content, one of that prompted that wouldn't be possible to watch content on a rooted device.
In first place I tryied to talk with the seller in order to get a non rooted firmware or to disable it but he hasn't been so collaborative ("I will ask my engineer" and then disappeared).
Then I tryied to remove/hide root permissions by app but after installing "supersu" the box never booted again: stuck at the "android" logo.

• I tryied to factory reset the box but it won't boot. I tryied also to wipe cache, wipe param and everything else on the recovery menu.
• I have tryied to re-flash the firmware using usb burning tool (2.2.0 and 1.7.something) and some S905X3 image available on this site with no luck:
  [0x10103003]Romcode/Initialize DDR/Download buffer/USB transfer error

Actually I have no more ideas except to ask to someone more expert than me, I hope that someone can help me.
Thank you

[mrday]

up...

[mrday]

I'm adding some picture showing the inside of the box.
I also tryied to "apply update from ext" using a micro sd card and this zip but I got "signature package verification failed".

[Guest]

Your tv box is A95X F3 Air clone. [photos - 4PDA.ru]

[mrday]

wow! many thanks I just installed 2 differents img: a custom russian rom and another one that shoud be the stock IMG.
Now I just need to remove the root permission or hide it, where I can find infos about this process?
thank you

[mrday]

I tryed to turn off the root switch in the advanced settings panel but the application that I need to use identify the device as rooted anyway..