Rooting a Lenovo TB-X605LC

My Lenovo Tab M10 FHD (TB-X605LC, 2019) was sitting at status low on memory before any apps were open. I use it for reading on Moon+Reader. An afternoon with a Debian terminal fixed that.

The Problem #

2GB RAM in 2026. Android 9. Google Play Services alone wants 1.2GB at baseline. The lag wasn’t slow CPU — it was constant process churn as the OS killed and restarted background apps under memory pressure.

The fix was already baked into the kernel: zRAM — a compressed swap disk that lives entirely in RAM. The driver was compiled in, the block device was present, nothing was switched on. Root was the only thing between that and a usable 1GB of compressed swap.

Quick Wins Without Root #

Before touching the bootloader, a few things that are fully reversible and carry no risk:

• Cut animation speeds in half via adb shell. The UI immediately feels snappier — this is the single highest-impact change on a slow device.
• Disable Lenovo bloat — seven pre-installed packages (OTA updater, wallpaper service, screen assistant, telemetry) that run at boot and serve no purpose on a personal device.
• Kill location services — five GPS daemons were running at idle. Turning off location mode dropped them all at once.

These steps together freed roughly 60MB and can be undone with a single command each.

Rooting #

The TB-X605LC is Snapdragon 450, single-partition (A-only). TWRP exists for nearby variants but not this one, so the path was Magisk on top of a stock boot image.

The bootloader unlock has a quirk on this firmware: the Developer Options toggle for OEM unlocking doesn’t persist. It has to be forced via adb shell before rebooting into fastboot. And where most modern devices use fastboot flashing unlock, this one requires fastboot oem unlock-go — a wipe-and-unlock command that the standard unlock path explicitly tells you to use instead.

Getting a boot image without root meant pulling stock firmware (S000100, one minor version ahead of what was running), extracting boot.img, feeding it through Magisk’s “Select and Patch a File” on the tablet itself, and pulling the patched image back over ADB. Flash it, reboot, done.

zRAM #

Lenovo had already configured zRAM at 1GB in the kernel. Root confirmed it was there and mounted — the OS just wasn’t calling swapon. A small Magisk boot script fixed that permanently.

Result #

Before:

Total RAM: 1,880,248K  (status low)

After:

Total RAM: 1,880,248K  (status normal)

status normal means Android is no longer in crisis mode. It’s the same hardware — the OS is just no longer thrashing under memory pressure every time a background process stirs.

Boot time is still ~2 minutes. That’s hardware init — the touchscreen firmware sequencing alone accounts for most of it. Not worth chasing.

Annexure — Commands #

No-root tweaks (run inside adb shell) #

# Animation scaling
settings put global animator_duration_scale 0.5
settings put global window_animation_scale 0.5
settings put global transition_animation_scale 0.5

# Disable Lenovo bloat
pm disable-user --user 0 com.lenovo.ocpl
pm disable-user --user 0 com.lenovo.dsa
pm disable-user --user 0 com.lenovo.ota
pm disable-user --user 0 com.tblenovo.whatsnewclient
pm disable-user --user 0 com.tblenovo.whatsnewhost
pm disable-user --user 0 com.tblenovo.wallpaper
pm disable-user --user 0 com.lenovo.screenassistant

# Kill location
settings put secure location_mode 0

Bootloader unlock #

adb shell settings put global oem_unlock_allowed 1
adb reboot bootloader

fastboot oem unlock-go        # wipes the device
# Note: fastboot flashing unlock fails — use oem unlock-go

Patch and flash boot image #

# Push stock boot.img to tablet, patch via Magisk app, pull back
adb push ~/boot.img /sdcard/boot.img
adb pull /sdcard/Download/magisk_patched-*.img ~/magisk_patched.img

# Flash
adb reboot bootloader
fastboot flash --disable-verity --disable-verification vbmeta ~/vbmeta.img
fastboot flash boot ~/magisk_patched.img
fastboot reboot

# Verify
adb shell su -c "whoami"      # root

zRAM boot script #

# Heredoc ! trips up bash history expansion — use a temp file
cat > /tmp/zram.sh << 'SCRIPT'
#!/system/bin/sh
swapon /dev/block/zram0
SCRIPT

adb push /tmp/zram.sh /sdcard/zram.sh
adb shell su -c "cp /sdcard/zram.sh /data/adb/post-fs-data.d/zram.sh"
adb shell su -c "chmod 755 /data/adb/post-fs-data.d/zram.sh"

Verify zRAM post-root #

adb shell su -c "cat /proc/swaps"
# /dev/block/zram0  partition  1048572  439788  32758

adb shell su -c "free -h"
# Swap: 1.0G  429M used  595M free

Tools: Debian Linux, android-tools-adb, android-tools-fastboot, Magisk v30.7, stock firmware from firmwarefile.com.