Sum sum sum..... MANY people managed to screw the box up and then don't know what to do!
Worst case scenario is when the bootloader gets damaged through power surge or pulling the plug whilst the Flash is unprotected (unfinished flash attempt).
Still it can be fixed but NOT with DreamUp but with a JTAG programmer.
Normal issues like stuffed up image file (CRC error through download failures and corrupted files) can be fixed with DreamUp.
Procedure is to load an "empty" image file to the box, only containing $ FF FF values and then reflash the box with the factory image which restes the box completely to factury status!
The difference between the "slow" and the "fast" flashing mode is fairly simple..... the fast mode is using LAN connection when an IP address can be found thus shuffling data in mbit/s speed to the box rather then kbit/s with the serial cable
