Did it! The screen suction handle did not work. I kind of pressed it very very hard, but after that it did not apply enough suction force. So I just used the Jimmy tool, which scraped the edge of cover from black to metallic a bit until I understood that it has to be not horizontal but pointing kind of down, then it worked and I could get in the blue plastic opening tools to pry the bottom side outwards.
Also reassembly had to be made first on the power button side, then top, after that it went well.

Could it be possible to change SDIN8DE4‐16G to SDIN8DE4‐32G? Both hardware and software wise, so it is able to boot. Thus getting 32GB storage instead of 16GB.