Yes, all latest Rebug CFWs are REX including 4.30.2. I never used DEX before, but as far as I know, it's needed if you have a broken BD-Drive to be able to emulate it and play games that don't run discless, you can also mount games over the network and it has some Debug settings not found on CEX.
Originally Posted by knobtwiddler
But it's a little complicated to use all those features and I don't think you need them so it's best to stay on CEX.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!