As you do not have the device in your hands the first thing is to confirm your friends HWID from the garmindevice.xml or give him the link I sent via PM.
If your friend uses the wrong firmware he will no longer be your friend as you would have remotely bricked his device.
<PartNumber>006-B2267-00</PartNumber>
<SoftwareVersion>590</SoftwareVersion>
<Description>DriveSmart 50</Description
Firmware is determined by the HardWareIDentity not the device description.
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Not patched.
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Not for this device for GPSMAP276cx
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The SD card Patch kit is the install version, just follow the instructions
Please DO NOT post the same questions in multiple threads