🤖 Android KernelSU-Next for Samsung Galaxy A20s (SM-A207F / msm8953)

[KuririChan]

KernelSU-Next for Samsung Galaxy A20s (SM-A207F / msm8953)​

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Custom kernel for the Samsung Galaxy A20s (SM-A207F / msm8953 / sdm450) with built-in KernelSU-Next legacy root support, full SELinux Enforcing compatibility, and performance fixes.

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Supported Devices​

Device Model	Codename	Platform	Android Version
Samsung Galaxy A20s (SM-A207F)	a20s / a20sxx	Qualcomm Snapdragon 450 (msm8953)	Android 11 (One UI 3.1)
Samsung Galaxy A20s (SM-A207M)	a20s	Qualcomm Snapdragon 450 (msm8953)	Android 11 (One UI 3.1)
Samsung Galaxy A20s (SM-A2070)	a20s	Qualcomm Snapdragon 450 (msm8953)	Android 11 (One UI 3.1)

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Features​

• KernelSU-Next Legacy Integrated: Built directly into the kernel source (v3.2.0-legacy) running in Manual Hook Mode for Linux 4.9.
• SELinux Enforcing Supported: Full root privilege separation under u:r:ksu:s0 without requiring permissive mode.
• OverlayFS Enabled (CONFIG_OVERLAY_FS=y): Full support for systemless root modules (ZygiskNext, ZygiskKSU, etc.).
• Connectivity & Battery Drain Fix: CONFIG_CNSS_GENL=y enabled to fix the Qualcomm cnss-daemon ~61% CPU spinning loop.
• Samsung SAR Compatible Installer: Custom AnyKernel3 configuration configured for System-as-Root boot partitions without ramdisk unpack errors.

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Downloads & Releases​

• Kernel Package: Download KSU-Next-Kernel-A20s.zip from the You do not have permission to view the full content of this post. Log in or register now. section.
• Boot Fix: Fixboot.zip (Required for Samsung A20s boot compatibility).
• Manager App: Download the latest KernelSU-Next Manager APK from the You do not have permission to view the full content of this post. Log in or register now..

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Installation Guide​

WARNING: Unlocking your bootloader will wipe your device data and trip Samsung Knox (0x1). Always back up your critical files before flashing custom kernels.

Prerequisites:

1. Bootloader unlocked on your Samsung Galaxy A20s.
2. Custom recovery installed (TWRP or OrangeFox).
3. Downloaded KSU-Next-Kernel-A20s.zip and Fixboot.zip onto an SD card or internal storage.

Step-by-Step Flashing:

1. Boot into Recovery: Power off your phone, then hold Volume Up + Power until the TWRP / OrangeFox splash screen appears.
2. Backup (Recommended): Go to Backup and create a backup of your Boot and DTBO partitions.
3. Flash Kernel: Tap Install, select KSU-Next-Kernel-A20s.zip, and swipe to confirm flash.
4. Flash Fixboot (Crucial): Select Fixboot.zip and swipe to confirm flash. (This step fixes the Samsung A20s boot verification/encryption bug.)
5. Reboot: Wipe Dalvik / ART Cache (optional but recommended), then tap Reboot System.
6. Install Manager: Once booted into Android, install the KernelSU-Next Manager APK, open the app, and verify that the status displays Working (BUILT-IN (LEGACY)).

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Building from Source​

Requirements:

• OS: Linux (Debian 12 / Ubuntu 22.04 LTS / WSL2)
• Build Tools: make, bc, bison, flex, cpio, zip, python3
• Toolchains: AArch64 GCC 4.9 & ARM32 GCC 4.9

Compilation Steps:

# 1. Clone kernel repository & toolchains
git clone https://github.com/yiesko/android_kernel_samsung_a20s -b main kernel_a20s
cd kernel_a20s

# 2. Setup KernelSU-Next legacy driver
curl -LSs "https://raw.githubusercontent.com/KernelSU-Next/KernelSU-Next/next/kernel/setup.sh" | bash -s legacy

# 3. Export toolchain variables
export ARCH=arm64
export CROSS_COMPILE=/path/to/toolchains/gcc-arm64/bin/aarch64-linux-android-
export CROSS_COMPILE_ARM32=/path/to/toolchains/gcc-arm32/bin/arm-linux-androideabi-

# 4. Generate defconfig & compile
make O=out a20s_eur_open_defconfig
make -j$(nproc) O=out

# Output binary will be at: out/arch/arm64/boot/Image.gz-dtb

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Troubleshooting & FAQ​

• Q: The phone is stuck at the Samsung boot logo.
  A: Flash Fixboot.zip immediately after KSU-Next-Kernel-A20s.zip before rebooting into system.
• Q: KernelSU Manager says "Unsupported" or "Not Installed".
  A: Verify that you flashed KSU-Next-Kernel-A20s.zip without errors and installed the KernelSU-Next Manager (not standard KernelSU).
• Q: Root is not working in ADB Shell.
  A: In the KernelSU-Next Manager, go to the Superuser tab and grant root permission to Shell (UID 2000) or your target app.

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Credits & Acknowledgements​

• You do not have permission to view the full content of this post. Log in or register now. for the Samsung Galaxy A20s kernel source tree and patches.
• You do not have permission to view the full content of this post. Log in or register now. by rifsxd and contributors.
• You do not have permission to view the full content of this post. Log in or register now. by tiann.
• You do not have permission to view the full content of this post. Log in or register now. by osm0sis.
• Samsung Open Source Release Center (OSRC) for the base kernel source.

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[espraket]

Thanks for sharing lods.