City Navigator Europe NTU 2019.20

Nüvi 27x7/8 (HWID 1517) doesn't have any Map Signature but
Nüvi 27x7/8 C4 (HWID 2077) has Strong Map Signature and needs Firmware Patch.
You should verify HWID of device, if it is 2077 you can find SD Package and Instructions to Update

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FireFox58 Reviewed by FireFox58 on 28th December 2018. City Navigator Europe NTU 2019.20 On August 29, 2018, City Navigator Europe NTU 2019.20 appeared. FID 7677 CN Europe NTU 2019.20 Central Region for those who need help. Coverage https://s15.postimg.cc/7mam7fgkb/Central_Region.jpg Rating: 5

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Not 100% certain but i think that there wasn't a 27x7/8 device made with a C4 chip and both HWID 2077 ("C4") and HWID 1582 ("non-C4") are what Garmin refers to as its 2xx7/8 devices which means only the 24x7/8 4.3" and 25x7/8 5" series. If so then all US and most EU 27x7/8 devices are HWID 1517 with PCB P/N 105-01878-02 with no C4 version. I'm happy to be corrected however. I also have a recollection of a European DAB Traffic-capable device named "nuvi 2798" packaged with a GTM70 and it has a different HWID of 1884, but it's still same PCB as other 27x7/8 devices with no MSV protection in firmware and also not a C4 device.