If you don't know what DEX is, you're almost surely on CEX. CEX are retail consoles that the average consumer buys. DEX are developer consoles that developers use for making games. There are ways to convert a CEX console to DEX mode, but most people don't do it, you would know if you had done it, and someone selling it to you second hand would almost surely mention it.
Rogero 4.46 is only available for CEX, so you are 100% for sure on CEX. Heck, the download for Rogero 4.46 v1.00 is even named " Rogero_CEX4.46_V1.00.PUP"
Use ReactPSN 2.26. It is the latest version and should work (but if it doesn't then that means no ReactPSN version will).