Dell Inspiron 1520/1521/1525/1526/1720/1721 BlueTooth 2.0+EDR Module 0RJ421
Dell Drivers and Utilities DVD for Inspiron 1420, 1520, 1525, 1526, 1720 and 1721 (UP315 rev. A11) (2008) : Free Download, Borrow, and Streaming : Internet Archive
Dell Inspiron 1720 Wireless issue - Dell Community
Support for Inspiron 1720 | Drivers & Downloads | Dell Australia