In those cases, — not even from a real PC.
On the (the phone that will act as the computer), open Termux and update the package list: unlock bootloader using termux link
Unlocking your Android device's bootloader is the first step toward true ownership. It allows you to install custom ROMs, flash Magisk for root access, and utilize custom recoveries like TWRP. While traditionally done via a PC, you can now perform this process using another Android device via . In those cases, — not even from a real PC
However, (e.g., engineering bootloader, unlocked aboot, or using an exploit like CVE-2020-0041). In those cases