If you have a code signing certificate, would it be possible to add that digital signature to Unicode maps? 
Every codepage works on the newer devices - as long as the codepage is supported by the device - even codepages like Simplified or Tradition chinese Characters. For some languages however no codepage exists (very few) while they are covered by Unicode).

On Sat, 31 Jul 2021 at 16:18, Andrzej Popowski <popej@poczta.onet.pl> wrote:
Hi,

I think different models of GPS react differently. Most common is that
new devices require digital signature for Unicode maps. Maps with CP1252
usually work. At least handheld GPS, more problems could be with nuvi.

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Best regards,
Andrzej
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Felix Hartman - Openmtbmap.org & VeloMap.org