June 25 (Reuters) - Canada’s main stock index fell on Friday, with BlackBerry Ltd leading declines following quarterly results, but the index was set for weekly gains. * At 9:35 a.m. ET (1335 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 9.35 points, or 0.05%, at 20,205.77. * Canadian security software supplier Blackberry fell more than 2% in early trading, even after beating Wall Street estimates for quarterly revenue on Thursday. (Reporting by Shreyashi Sanyal in Bengaluru; Editing by Devika Syamnath) Our Standards: The Thomson Reuters Trust Principles.