This Listing is for an Aladdin XT Modchip.
These are a tried and true Modchip for the OG Xbox.
For all Pre 1.6 consoles, I'd Softmodding and then TSOP flashing the console.
You can find a solid TSOPing Guide Here
With 1.6 consoles however, TSOP Flashing is not an option and a modchip is required to run a custom bios.
Sometimes a modchip is required from Pre 1.6 consoles. In the event of a hard drive failure, you will need to install a modchip in order to add a new hard drive of your choosing.
Full Aladdin install guide can be found here
Once you install the chip, I highly recommend running the latest hexen Boot Disc and flashing the latest EvoX bios file.
I'll do a full 1.6 Video guide in the near future.