Yiming,
Thanks for your suggestion! Indeed, that's probably part of the modifications that were applied...
Unfortunately, there seems to be something wrong with the menu:
Of course, the fonts are wrong, but another thing: when I repush the menu button, it doesn't open a submenu (where I could "navigate" to update) ... I don't know if it's just a side effect of the font issue or something worse (modified firmware, broken firmware, etc...)
So... even if this BIN was the correct way to restore functionality, I do not know how to apply it.
Guillaume