Here is a link that shows you how to reset the mileage, where the chip is at on the cluster, what software you need, and how to do it.
http://www.toyotanation.com/forum/103-3 ... mming.html
If you can not do it yourself; then here are other options. You can send the cluster away and pay someone to reset the mileage for you. Ebay has a list here:
http://www.ebay.com/sch/sis.html?_nkw=T ... nt+Cluster
Last you can read more about this problem on this forum board here:
viewtopic.php?t=36445
You will have to weed through the bad info. Good luck and you can also Google about the 299,999 problem as it is a known issue (the chip can not hold a hex value higher than that). Also changing the mileage will throw red flags about your title and inspection, etc. so make sure you document and take pictures before and after for proof so you do not get in trouble with the law.