There's a very easy way,make a full copy of the files on his XL then,delete all his installed files and try booting up using just the SD card in his XL.If it starts you know it's not using any files on his internal memory,if it doesn't let you use the map you know that it still needs cracking,if it doesn't do anything at all then you know either the files on the card are no good/corrupted or that XL isn't happy with the SD...if its a HCSD you may need to upgrade the bootloader to use it.
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