Timmie Posts 447 WRZ$ 1.00 Device Android Sep 14th, 2016, 3:51 am #3817951 by Timmie SIS and SISX File ERRORS InfoNote:If you will find unknown file error or unknown extension error. So please try to renaming the extension to SIS instead of SISX and vice-versa. Sep 14th, 2016, 3:51 am