Ensure your device has at least 60% battery to prevent sudden shutdowns.

: Power off the device, then hold Volume Up + Volume Down while connecting it to a PC to enter Download Mode. Follow the on-screen prompt to long-press Volume Up to unlock the bootloader. Note: This will factory reset your device. Installing TWRP Recovery

Toggle on and OEM Unlocking . Note: If OEM Unlocking is missing, connect to Wi-Fi and wait a few minutes, or change the device date back by 7 days. Turn off your device completely.

The official TWRP developers strongly advise that you first root your device with Magisk before attempting to flash TWRP. Rooting first disables the protection mechanisms that would otherwise cause a bootloop.

Without unlocking the bootloader, the device security systems will reject any custom files, preventing both the installation of TWRP and the application of Magisk root. 🔑 Core Requirements for the Samsung Galaxy A20 (SM-A205)

Since we are following the recommended path of rooting before TWRP, you need your device's stock firmware.

: Crucial on updated Android builds to prevent the phone from getting stuck in boot loops or triggering verification errors.