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Hi, I have a 2015 S5 also with the 3G "high" MMI.

I'm on firmware HNav_EU_K0257_6_D1 and have been told it is the latest for 3G high. I managed to update to 2021 maps without needing a further FW update.

Also, be aware you can get that firmware for free on here, be weary of any sites that want to charge you for it.

Hope that helps.
 
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