i cannot update the android version of my htc amaze 4g

[AC Question]

ive heard that there may a problem with my phone storage... i was suggested to download amaze clear memory but this app is no longer available on the internet... i followed the steps to update that which is menu>about phone>software updates>check but as soon as i touch the check button answers that your phone is up to date and there are no updates available for your phone... i use wifi internet connection with medium speed .. my android version 2.3.4 now. i need your help. thank u