NO DON'T LISTEN TO HIM I KNOW WHAT YOU NEED TO DO BECAUSE I HAD THE EXACT SAME PROBLEM WHAT YOU NEED TO DO
IS GO ONTO GOOGLE AND SEARCH "4.21 Rebug UPdate" THEN GO TO THE FIRST LINK AND DOWNLOAD THAT PACKAGE FILE!!
INSTALL IT AND THEN DELETE IT AND DO THE NORMAL PROCEDURES AND YOU CAN GO ONLINE THANK ME LATER BRO