Once you are in via FTP, you need to be a bit of a Hacker to find a weakness to exploit.
The FTP is pretty open by default, you can go anywhere and copy files back and forth with
the only restriction being the file system permissions.
See if you can modify anything run at system boot, via crontab (your own as well as the system one), or executed via the web interface to act as a script launcher.
If you find something write a small script that will make the changes you require and FTP it across.
So you say that I just need to strip the wires on the non-USB side and just stuff them into UART port
That is what I did, checking everything three times to make sure nothing was shorting out and that I had the connections round the right way before
connecting the USB lead to my PC and powering up the plug. Get it wrong and likely say goodbye forever......this is a 'last resort' or 'adrenalin' hack
