Thank you for the information.
So, long story short, your unit has the latest map version for EU, which are packages
1U5T-14G421-BAJ
1U5T-14G421-BBJ
1U5T-14G421-BCJ
1U5T-14G421-BDJ
1U5T-14G421-BEJ
1U5T-14G421-BFJ
1U5T-14G421-BGJ
1U5T-14G421-BHJ
1U5T-14G421-BJJ
Sync3 is the N-1 version 22200. There’s a 22251 available, but since your unit is under warranty and updates seem to be working, I would not change that (bedsides, it’s not worth it, really).
I’m not sure if I would touch your unit.