Type adb devices and press Enter. (If a prompt appears on your tablet asking to Allow USB Debugging, tap "Always allow" and "OK").
Install and open the on your Windows PC.
(Optional but recommended for Android 10+) Flash vbmeta.img with verification disabled to prevent boot loops: fastboot --disable-verification flash vbmeta vbmeta.img
Unzip the firmware archive and copy the file named and vbmeta.img to your desktop. Step 3: Unlock the Tablet Bootloader
Rooting the Lenovo Tab M8 (TB-8505F) is a multi-step process that requires a PC to unlock the bootloader and flash a patched system image. Unlocking the bootloader will permanently delete all data on the device. deadbadger.cz Prerequisites PC with ADB & Fastboot: Download and install the Android SDK Platform-Tools Lenovo Rescue and Smart Assistant (RSA): Download the official Lenovo RSA tool to obtain the correct stock firmware for your tablet. Magisk App: Download the latest version of the Magisk app to patch the boot image. deadbadger.cz Step 1: Unlock the Bootloader Enable Developer Options: On your tablet, go to Settings > About Tablet and tap the Build Number seven times until "Developer mode" is enabled. Enable USB Debugging & OEM Unlocking: Settings > System > Developer Options and toggle both OEM Unlocking USB Debugging Enter Fastboot Mode: Connect the tablet to your PC. Open a terminal and type: adb reboot fastboot Unlock Command: Run the following command: fastboot flashing unlock Confirm on Tablet: Follow the on-screen prompt (typically pressing ) to confirm the unlock. The device will factory reset. deadbadger.cz Step 2: Prepare the Patched Boot Image Extract Firmware: how to root lenovo tb8505f top
: Use the Lenovo Rescue and Smart Assistant on your PC to download the correct stock ROM for your specific build number.
Disabling verification and rooting lowers the device's security profile.
: Use a high-quality micro-USB cable to connect the tablet to your computer. Software on PC :
Confirm the unlock on the tablet screen using the volume keys. The device will wipe and reboot. Type adb devices and press Enter
Connect the tablet to your PC via USB and authorize the RSA key on the tablet screen if prompted. Open a terminal on your PC and run: adb reboot bootloader Once in Fastboot mode, run: fastboot flashing unlock
Install the or the Lenovo Rescue and Smart Assistant (RSA) to ensure your PC recognizes the device.
He connected the tablet via USB. The familiar ding of connection echoed. "ADB devices," he typed. The serial number appeared. Good. "ADB reboot bootloader," he commanded. The screen went black, then flashed the Lenovo logo with tiny text at the bottom. He was in Fastboot mode.
: Download the exact firmware for your tablet model using the Lenovo Rescue and Smart Assistant (RSA) Step 1: Unlock the Bootloader On the tablet, go to Settings > About Tablet Build Number 7 times to enable Developer Options. Navigate to Settings > System > Developer Options and enable both USB Debugging OEM Unlocking (Optional but recommended for Android 10+) Flash vbmeta
: Type adb reboot bootloader (or adb reboot fastboot ).
Use the Lenovo Rescue and Smart Assistant (RSA) tool on your PC to download the official firmware for the TB-8505F.
The most reliable method for this specific tablet involves and using Magisk to patch the device's boot image. Prerequisites & Preparation Before you begin, ensure you have the following ready:
Magisk will create a magisk_patched.img file in your Downloads folder.