Yes have read a lot from few days to understand how it works, and did not know you are on other forums so I try to ask on another one too sorry,
as you said it is a device restriction there is no ASR folder at all.
Now I have understood that it is garminexpress/webupdater that install ASR files,
but I have realized that the asr folder I got from another place is missing some files (srd files), so not good yet.
By the way I placed the other map part on the sd like you proposed and it is well recognized (europe north all).
Last thing I tried is to add ASR manually in the garmindevice.xml file for garmin express to download speech recognition files in my device but seems not working.
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