That's really hard to do in the general case, since I know nothing about your phone or how locked down it is (other than that it presumably runs Android 9). Hon

That's really hard to do in the general case, since I know nothing about your phone or how locked down it is (other than that it presumably runs Android 9). Honestly, support is spotty and it's usually easier to purposefully buy a device that's well supported for some method than it is to start with whatever device you have in your pocket and go from there. That said, you might get lucky and find a method for your device by searching the XDA Developers Forum for it. On that forum you can also find multiple bootloader projects that each support different devices to varying degrees.