Page 1 of matshita dvd rom sr 8585

i have had for a while a dvd rom listed above but it is region locked , it requires a firmware upgrade which i downloaded from a site listed on one of the forum posts , but the problem is that it requires to be loaded in real dos mode . i have a new computer which has a windows based dos on windows 98 se and it will not let me load it can someone help.
Thanks in advance