How can I patch TomTom navcore for Mazda NVA-SD8110

Sorry, but this post is titled "patch navcore mazda nva-sd8110" and this is definitely NO "NB1".
It is also different to the Carminat Live in terms of navcore because NVA uses NC 9.867 while Carminat uses NC 10.xxxx.
The patch is no problem any more since I found the file that can be successfully patched by ttactivator.
The problem is that TOMTOM has secured the ttsystem file with a checksum and the NVA (maybe simmilar to Carminat) does only accept upgrades with valid checksum !!!

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Since the MD5 and BLOWFISH algorythm is known it should be possible to create a valid checksum but I do not know where to put the resulting bytes?
I am pretty sure that also Carminat could be patched in the same way if we can overcome this checksum issue.

Goofy_53 Reviewed by Goofy_53 on 13th August 2021. How can I patch TomTom navcore for Mazda NVA-SD8110 Hello, I'm trying to update a TomTom system which is in a Mazda => NVA-SD8110 It's an original SD-card. With TomTom Home I found the content of the ttgo.bif file (which is NOT on the SD-card??) so I know the Unique Divicenumber etc. But there is no ttsystem or PND navigator file present on the SD-card so I'm not able to patch the navcore. Can someone help me with this? I would be very greatful. Rating: 5