2004 volvo xc90 with blank radio display

Q: We have a 2003 Volvo XC90. We took it to the dealer bc radio display went blank. They told us the ICM needed to be replaced. Is there a way to tell if this ICM will be compatible with our car? Is there an item number or some distinguishing number that we could match up to see if it would work? Is an ICM a plug and play device or does it need to be flash with the computer? What is your return policy if the item 1) does not work or 2) is not compatible? Is something like this difficult to replace on your own? Do you have any knowledge of the condition of the item except that it is used? Thank you for your time!
A: Yes, all you need to do is replaced with my unit but you need to make sure which display you have in there if you have premium sound than this is the correct unit if you have high performance sound you need ICM with numeric display, once it is replaced it should work right away without software download but there have been cases that it needed software download, it is easy to replace it so you dont need to pay anybody for doing it, I will provide you with step by step instructions,

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