On his PC, Elias opened the command prompt in the folder containing his TWRP file. However, he knew another secret: on most modern devices with A/B partitions (seamless updates), you don't "flash" TWRP permanently the first time using sideload. You often have to "boot" it temporarily first.
Keep in mind that installing TWRP and custom ROMs can void your device's warranty and potentially brick your device if done incorrectly. Always research thoroughly and follow trusted guides to minimize risks. android system recovery 3e install twrp
Go to Settings > About Phone and tap "Build Number" 7 times. Then, in Developer Options , enable USB Debugging and OEM Unlocking (if available). On his PC, Elias opened the command prompt