I found sort of the same manual,but which chip do I have to shortcut?
The hynix one or the trontech one?
You can short either the Hynix memory chip or the EtronTech chip.
I would recommend you try shorting the EtronTech chip with small metal tweezers CAREFULLY as it is more successful to get it into firmware upgrade (shown as "rockusb") mode.
I strongly recommend to try using this VX858LE clone firmware (download here: http://www.mediafire.com/?2n1gnqiy3xg
) to update your VX858LE clone after you get it into firmware upgrade mode.
Your MP4 player is a VX858LE clone.
If your VX858LE clone still has only 2GB of internal memory then I guess one of the memory chips failed (they use two 2GB memory chips in the 4GB VX858LE clone) and you'll have to either refund or exchange your VX858LE clone to the original supplier if possible. Your memory problem makes your VX858LE clone look like the first reported hacked Rockchip-based MP4 player, with 2GB of usable internal memory instead of the advertised 4GB of internal memory.
_________________My primary device:
Apple iPod touch 8GB (2nd generation) with iPhone OS 3.0 software update (jailbroken with redsn0w)