I downloaded Z4root 1.3.0 on my PC. I put it on my micro sd card. I put the card in my tablet. I find the file with the file manager. I tap on it to install it but I get the message that the file is protected and cannot be opened. I tried this with another file I had on the card and I got the same message about that file. Maybe this is a card issue? I formated the card and tried again with only the Z4 file on the card but I got the same message. Any ideas?