are you installing rex 4.81.2 or d-rex 4.81.2 cause you can't install d-rex on cex 3.55 you probably need to install rex version first, then you can switch to dex if you like or stay on cex
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REBUG 4.81.2 REX EDITION
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also are you on 3.55 ofw or cfw if on 3.55 ofw then you need to install 3.55 jailbreak first then you can install REBUG 4.81.2 REX EDITION also toggle qa before updating to REBUG 4.81.2 REX EDITION
you can get a 3.55 jailbreak here
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