could somebody please tell me the command, to format the internal hd via telnet, so that i can easily install the custom firmware again? because i can't erase hd over the webui, also not when ubsa-mode is disabled. :-(

i have at the moment the custom firmware running, but i have several problems (because i have installed/deinstalled upgraded/downgraded the firmware it many times) and now i hope to format that solves the problems.