Hi, I've added a little information the the serial protocol the E2's PBL bootloader talks over UART0. http://inputplus.co.uk/ralph/emailer/ (Sorry for the `drip, drip' of emails rather than one all-encompassing one, but I don't want to hold releasing information if I suffer from lack of time.) A later version of PBL is used in the E3 according to Jonathan's dmesg output. Cheers, Ralph.