You are misunderstanding. You only need to collect consent via opt in if consent is your basis of collection.

There are several other basis as well including ‘legitimate interest’. You can see all of the basis in article 6(1).

If you use a different basis you don’t need to collect consent at all whether opt in or otherwise.

Hardware data from crashes used just for cause analysis and properly stored/secured is a fairly straightforward ‘legitimate interest’ argument.