Thanks for your help so far.
Ultimately it failed. I installed Smart Switch, ran something called Emergency Recovery…
It did not work. The screen is now black and the phone does not even start.
It has been a total nightmare. 4 days of work, endless problems and frustration. One of the worst IT-related projects I have experienced. But of course, I am just an ordinary guy, IT-wise, with no experience in mobile phones, so that was probably to be expected.
But it would be great if guys like me could do this, then /e/ would become a serious challenge to big tech.
Crazy as it seems, I am still not giving up. Although /e/ installation, at least in my case, seems quite lacking and undeveloped still, I realize the need for a deGoogled and Apple-free phone. So I am buying another Samsung Galaxy S7 and will try again.
Would be better to buy a pre-installed phone yes, but the phones in the shop does not suit my taste, too large. I like the Galaxy S7, small and light.