[OnePlus Nord 2 5G] Releece:
Yep that should do it, looks like you did your research and understand the process.

I had the same question earlier. Strangely I found that the Nord 2 does not have A / B partitioning. I can only detect an A-partition with apps designed to test it. I didn't have to do anything extra / another way while rooting with Magisk, OTA updates or flashing ROM. I thought A/B was enforced on all phones since Android 10 or sth, but apparently not all.

I would add one extra step, after you reboot into TWRP (before flashing the ROM) make a backup of all the individual partitions one by one (so you can restore any single partition in the future), even the tiniest ones.

Some contain calibration data for e.g. Bluetooth and fingerprint sensor that are specific to your device. Now this whole process should leave them untouched, but if anything ever happens to them, the only way to get your phone working again is to send your phone to a service centre, so it's a good idea to have everything backed up.

They will be stored in the TWRP folder in /sdcard/, which is the folder you can see on your PC. So after backing them all up, you can just copy them to your PC.

I successfully flashed Evolution yesterday, and all went well :) Initially the new Android 13 UI was a bit of a shock from what I was used to, but I'm starting to like it already, especially after going over the settings. And it works smooooth like butter. The only thing that annoyed me was the haptic feedback, which feels very mushy instead of snappy. But putting vibration strength to low helps a lot. Maybe I can find a way to modify it later.

I had one little hickup: Evolution install instructions say this for TWRP before flashing ROM:

"3. Tap [Wipe] , then [Format data]. type "yes" and Enter"

But when I did this, it removed the media folder at /data/media/ instead of just emptying it. I remember it gave me a pop-up saying something like, for /data/media/ to get populated I would probably need to boot to system. But if I would've done that stock would overwrite recovery.

I don't have a lot of knowledge about this, but this folder gets mounted to /sdcard/ and is where your internal storage is mounted to. So after the wipe I wanted to copy the ROM .zip to my phone using the file manager. Windows did recognize my phone as having internal storage, and I could open it, but it didn't see any file/folder/free space and I couldn't copy anything to it.

I solved it by renaming ROM to sth simple like evolution.zip, placing it inside platform-tools folder, and then using ADB push command, so it looked like:

ADB push C:/platform-tools/evolution.zip /data/

It doesn't give any feedback while copying and I didn't even see much disk usage on Windows task manager, so I was about to get nervous and close the terminal, but then it suddenly completed successfully and I could see the evolution.zip in TWRP file manager. After that flashing took just a few minutes and everything went perfect.

Now I don't know if it's maybe a typo in the instructions or if TWRP had a bug, but I don't think so as it specifically gave me a prompt about it. I think it's better to just tap [Wipe] and then do the usual factory reset slider, with data, dalvik and cache selected. Think I'll make a post later in the Evolution thread to ask.

Good luck!