i didn't need to uninstall the old one first, just ionstalled the new .deb, rerstartet whatsapp , and i'm good to go, don't use groups anyways. but i encountered an error oO when trying to send an image to a galaxy S3 both tests came out with "not enough memory" on the s3 devices , is that a problem with me or with the galaxy? images form other senders worked fine on the S3.Galaxy S2 works fine as a receiver Lumia 710 too.