These are just my notes, and described process worked for me on my 1C robot
If anything goes wrong, having USB adapter for FEL flashing might be the only way to restore your robot
this is not an official guide
oh, and I'm not responsible for any damage blah blah
and huge thanks to Dennis and Hypfer, and everyone behind this root :)
to enter uboot shell on 1C you have to: 0. turn robot off normally
- hook up uart, open console