flashing assistance requested please

whilst away someone helpfully flashed my BE16NU50 to 1.04. have removed this by flashing with mkv. amended 1.04 but new sdftool flasher errors when trying to return to original 1.01 firmware

any help appreciated.

also because of the venerable burners age purchased a new WH16NS58 which has firmware 1.v8 (I) on it.

can’t budge this vinpower firmware at all.

again any help appreciated.

thanks for your time