Asakusa Eki-Iriguchi and Koen Minami 0.00 bug solved by hexediting

I finally solved my problem with the 0.00 'Miata' time bug on the Asakusa Eki-Iriguchi and Koen Minami courses!  I downloaded a hacked saved with all the events opened but nothing completed.  I then set laps on each course, saved the game and then looked at that main save file via a hexeditor.

I managed to identify the addresses for each of these courses and then edit the code on my main save so it made the game think they still need to be unlocked (see picture below).  Unfortunately for a number of hours, I was editing the wrong addresses that only affect the 'Record Time' not the actual 'Time' that remained at 0.00.  That is why you see the record lap time at 6 hours+!  Eventually I was able to find the right address and get the 0.00 times removed by copying a 'blank' hexidecimal code somewhere else in the save, hence the greyed out times.

I then switched on the 'Open All Cheat' via the Cheat menu (see 1st picture below) and this allowed said courses to be selectable (see 2nd picture below).  I then set a basic lap on both and saved (see 3rd picture below).  As a result the game wiped the record times with my basic lap.  Successful hexedit complete! 

I think this problem originated back in 2007 when I first completed the game.  I was using a bugged PAL copy (SS code) and somewhere the VMU must have corrupted slightly when saving.  So more a VMU save error than a coding error; if it was the latter, it would not have been fixable.