WATERLOO — A tweet on the BlackBerry Mobile Twitter feed announced Monday that Chinese smartphone manufacturer TCL Communication will stop making and selling BlackBerry-branded mobile devices as of August 31, 2020. BlackBerry’s brand licensing and technology support agreement with TCL Communication dates back to December 2016, which resulted in the launch of the Key series of smartphones (pictured is the Key2), manufactured by TCL and branded as BlackBerry Mobile devices. According to the tweet, which includes a statement originating from TCL Communication, the Chinese company “has no further rights to design, manufacture or sell any new BlackBerry mobile devices, however,...