Gen 1 vs Gen 2 model numbers?

Can anyone point me to where to see what model number = Gen 1 / 2?

i.e. Given a model number WDBCTL0040HWT-NESN , how can I tell what generation firmware is installed.

edit: I’m looking to buy a spare on eBay (or other sites) and I would like to know what the model generation is that I’m bidding on.

Thanks for any help!

Actually solved by FOX_exe in

https://community.wd.com/t/gen-1-vs-gen-2-model-numbers/202757/7

But having the summary in Q seems to make the most sense

Thanks to all for their help!

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