I don't have any idea of how Nokia 202 looks like but i believe its java. Kindly look for a Whatsapp.jar and Whatsapp.jad file by searching on google with index word: Whatsapp for all java phones. Whichever way u get it, they should be with _jar, _jad format. Just rename them by removing the underscore and replace with a dot for both. Then click option and select update.