主要看下面的answer Update 6/8/2015: Select users on Retail France (212.44.26.ghost_row.Retail.en.FR) and Retail Germany (212.44.26.ghost_row.Retail.en.DE) can download and install Android 5.1. Update 6/11/2015: Select users on Retail US (213.44.1.ghost_row.Retail.en.US) can download and install Android 5.1. Update 6/17/2015: Select users on Retail EU (212.44.26.ghost_row.Retail.en.EU) and Retail Asia (212.44.26.ghost_row.AsiaRetail.en.03) can download and install Android 5.1.