Bollywood is a revision of the Hollywood package inside the Wii first issued in mid-late 2008. It has modified timing from the original Hollywood, preventing older IOS versions from running and necessitating an update to all IOS versions and other software based on the IOS codebase for them to run on Bollywood. All Bollywood units also come packaged with a patched boot1, preventing use of the Trucha Bug to load unsigned code at boot time.
Bollywood units are more commonly known as LU64+, due to the original serial number variation which was observed in NTSC Wiis when they began to ship with Bollywood. (This is inaccurate, as many serial numbers prior to LU64 contain Bollywood chips).