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That's not a concern and is normal with many modern devices. RGN_Tool will also show HWID '0'. Other tools such as gfw.exe can show the HWID but as hexadecimal. For Drive/Drivesmart 40-50 series HWID 2267 that's 08DB in hex.
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Yes, fail-safe naming is 226701000570.RGN for V5.70 firmware.
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It depends on naming and placement in the card. Your device should recognize <any_name>.img in Garmin root folder but if it's not recognized change the name to 'gmapsupp.img'. Or you can make another root folder named Map and use <any_name>.img in there too. The *.img must be correctly unlocked of course or you'll see "Can't Unlock Maps" message.