Vocabulary builder and flash card feature on old kindle 2/3/dx!

I have been searching many forums for the above mentioned query, but could not find any thing related to this...:blink::blink:

I request here to alll the biggi developers to provide a way to install flashcard and vocabulary builder functionality on older gen kindle, as it makes no sense to me to upgrade kindle just for the vocabulary builder....:chinscratch:
Dont know why amazon left old gen kindle owners in dark by not offering this functionality.....!:o