cause i need a locked Bootloader or otherweise WhatsApp (which i unfortunately need) wont work, but coming from a rooted rom, unrooted android is unbearable> You can keep your bootloader unlocked and rooted and still get WA to work. Check this xda post: https://xdaforums.com/t/problem-with-whatsapp-and-bootloader-unlock.4642218/post-89755699

I have PIF and LSposed installed with denylist active for WA, Gplay and GplayServices. It’s working.

Well, everybody knows Black Eneloop Batteries’ Lives Matter!

You’re welcome!

Hi, I did a quick search for it and i see what you mean. Most of those site assume you already have bootloader unlocked and TWRP installed, but don’t even give good instructions anyway. Here’s a link i found that gives a detailed procedure from beginning to end. It’s from 2022 but it should work. I have done this on an old phone (galaxy A20). Make sure you backup your data. https://www.thecustomdroid.com/galaxy-tab-a7-2020-rooting-guide/ For degoogling, i would recommend looking up MicroG to replace Gplay store. Good luck!