- Unlock bootloader (depending on vendor, you have to do an online verification),
- flash a recovery.img,
- load into recovery mode (which, depending on the phone, might need extra work)
- wipe some caches,
- select new os/rom image,
- pray it doesn’t brick your phone.
You’d think someone would’ve learned a thing or two from the easy graphical installations linux and even windows have been offering since the late 2000s.
GrapheneOS is a very easy install and can be done simply by plugging your phone in and clicking some buttons on the browser.
Most OEMs make this intentionally difficult. Partly for security and stability reasons but also because that device is likely feeding them data and pestering you with ads, and that makes them money, which is really all that matters at the end of the day.
Only if your phone is a Pixel, which isn’t available in my country
Doesn’t matter if your phone is a Pixel or not, still works the same way.