firmware & tomtom v.6.02

[ausody]

i'm new to the N73 (believe standard model) and tks for all great info in here

my questions are can I upgrade the firmware to 3.0705.1.0.31 - MUSIC EDITION instead of the latest due to my old GPS receiver. what's the procedure and what's the use for product code pls

also, can't install the tomtom v.6.02. have copied all files to memory card and by the time run the "sis" file, message came up as "Expired Certificate" then stopped. have searched here and found nothing, can someone help pls......

[ausody]

have sorted out the expired certificate issue (should search more) by changing the date of the phone back to 2006

can anyone help with the firmware question pls.......

[thesonofthedevi]

i am having the same problem regarding tomtom and "Expired Certificate"