The one I shared was the same 9.541 TZ which you already have

might dig out the tomtom one 3rd edition I've got laying around, would the 9.541 tz be good for this? unable to find the full maps for arm9-mnt and all that, so I'm thinking of trying this tz version.

I'm reading stuff about the 9.541 only being related to gl2 chipsets, can anyone confirm if this fixes the issue related with the clock on the tomtom one third edition gl1 navigation device???