Batboard

Looking to upgrade the firmware on an HT 750. Current in the radio is R03.01.00. Radio is a low split low band TANAPA:PMUB1011A, Model:AAH25BEC9AA3AN. When I try and update the firmware to R05.17.01 using hardware that I know works just fine on other HT750's - she balks. Is it too old of a firmware to make the jump? What can I do to update the firmware? Thanks!

r3 should make that jump but if the radio don't like it for some reason just upgrade it to r4.xx first then go up to r5. Motorola claimed you can upgrade to new from any version but if I get r1 or r2 I do it in steps because they always gave me problems so now I don't play games with them, I just do it in steps

Where can I find the older versions of the firmware updates on MOL? Or is it a dealer only kind of a thing.