Unless you were using a pup with modified syscon the REX edition of rebug will not install over 4.82 OFW. You must first install a 4.82 CFW and enable QA flag and enable the update debug option in debug settings. From there you can insatll any firmware versio you want. If you were using a pup with a modified syscon then this is a peculular issue and id reccomend verifying the file. Beyond that i guess glad you got it working.