I can't get my kyros 7015 to update. Went to the website, followed instructions exactly and this is what I get: Finding update package... Opening update package... Verifying update package... E: failed to open/sdcard/update.zip (no such file or directory) E: signature verification failed Installation aborted. I rebooted it and tried again, received the same thing. When I open the device on the computer, it shows the file as being on the SD card. What do I need to do?