ASA 5505 ASDM included?

[wosully]

I have installed a few 5505's for a small business, and received one today that does not appear to have the ASDM.  I did not know this was an option, and maybe they bought the incorrect version, but the other two 5505's have the ASDM, and I am able to connect to it out of the box.  So, I performed a factory reset on the device, with the same results.  I entered the http server enable, and allowed inside access, even using different OS's and browsers to see if it's a machine issue. 

I can put the config out here, just wanting to know if this is something that I can resolve via configuration or if I have to purchase this, and why?

Thanks for any help. 

[jumora · Accepted solution]

Get a show tech and it should have image on it but if does not you normally should have a CD with the images.

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[wosully]

Got it.  Just had to TFTP the image to the device and then put in the asdm command:

hostname(config)# asdm image disk0:/asdmfile