I don't think you can dirty flash NikGapps after having Systemless BitGapps...or if you can I could not work out how to do this. I did a full back up in TWRP and also in the phone backed up all of my settings, apss like WhatsApp, Signal, Nova Launcher, Bubble UpNP, SMBsync2, Musicolette (I use this in AA and for local.music) AND then a full back up in MIGRATE. I then did a clean flash, brought back my apps using MIGRATE (if you have not done this you can find info on XDA...it seems reliable to me...have done it a few times now), loaded magisk, safetynet fix, reloaded Nova configuration...then set up my settings in the phone. The above is not quick....2-3 hours at least.@ttmob4 , is there any way to remove BitGapps that I had installed as "System Image", and install NikGApps or any other packages are? Else, instead, if I flash NikGApps on top of BitGapps using TWRP, will new package get installed? Is there any known issues afterwards? Thanks for your time Chief!