1.6 TDI EA288 Engine ID DDYA – Exhaust gas scandal – Software update

Hello, I’m new here in the forum and don’t know VW Motoren so well yet. I am particularly interested in the EA288 engine and the new “gas scandal”. As you read in the forum and elsewhere, all EA288 are allegedly affected by the exhaust system scandal and software updates. According to reports, the TDIs run much worse after the software update and there are problems with the DPF and the AGR valve. I have some questions about this. Is it true that the EA288 used to have NOx-cats and from MJ18 SCR-cats? The EA288 1.6 TDI with SCR-cat would have to have better exhaust emissions values than models without the SCR-cat. Is this still affected by the new “gas scandal”? From MJ18 the engine recognition of my knowledge is DDYA, i.e. all the models would have been delivered with SCR-cat. Can anyone confirm this? Does the EA288 DDYA require a software update, or does the new software already have the EYA update from work?