@
gingerbread
I can confirm only the stuff I tested my self
you can update to 4.20 dex and go back to 3.55 downgrader without any problem from xmb or TM ,
Rogero DEX-3.55 V1 cannot be installed from 4.20 on xmb, recovery mode or TM but install w/o problem on 3.55 downgrader.
i didn't test Rogero DEX-3.55 V2.