Help Reset Rb 1100

hi guys…

i have rb1100 with damage software , i want to format it and backup from another rb1100 , i know how to take backup , but i don’t know how to reset it , i do it like rb sxt but i failed , so any one can help me how to reset and format rb1100 . please consider that I’m beginner

Thank you All

/sys reset

it will ask for Reset the system to factory default