Power Off when updating, Failed to update firmware

hi, i was updating with USB and the power went off in the middle of the update, not when i start kemper stage i get this message:

nanoboot: furmFromUSB()

ERROR: unable to locate firmware file on USB device

failed to update firmware

i already check and the koas.bin file is in its folder on the usb,

Quote from kpahuitsing

just put kaos.bin in rootfolder (=topmost folder) of the USB stick, and it should update normally from the USB stick

thank you very much, its updating now! greetings!