Do a restart after replacing all rdd related from your computer.
Rest seems good.
I cannot find wallet.dat anywhere on my phone ;/ I made a copy of reddcoin wallet keys, but I have no idea what to do with this file. Where should I put it? Or where should I look for wallet.dat on Android?
Check whether you have an option to extract private key from that android app.
I never used an android app for REDDcoin. Will install one and look into it.