@yzc717
How have you named the map file? It needs to be gmapsupp.img in the Garmin SD root folder.
Check with GMapTool that it's correctly unlocked and that the MS Flag is set to '0' [zero] and not '1'. BC can't see maps with the flag set to 1.
Some units can only use map images of less than 2Gib. The full NA 2014.40 img is ~2.09GiB.
If you still have problems tell us your unit model and which post you got the img from.
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