Originally posted by xClayous1
So I downgrade to 3.55 and install rebug 4.70.3 D-rex correct then i can switch to cex whenever I want
In all honesty probably the best bet for you would be to install a REX based Rebug version.
That way you can swap between CEX and DEX when ever you like without having to swap CFW.
So for example if you installed the 4.75.3 REX you could then use IDPset to dump your CEX and DEX dumps and the EID Root Key once that is done you can swap between CEX and DEX without having to install any other CFW as REX & D-REX are the same CFW apart from one gets installed on CEX and the other gets installed on DEX.
So it would be like this:
-------------Flash CEX Dump = CEX
4.75.3 REX|
-------------Flash DEX Dump = DEX
I hope this makes sense if not I will try to explain it a little better