TWRP device tree for Lenovo Legion Y700 (2023) (TB320FC)

8.8 inch a high-end tablet released on 2023.

Flash instruction

Make sure your device is a CN/Global/JP version of Y700 (2023) before proceeding.

1. Unlock bootloader
   • For detailed instructions, please see the following article.
     https://xdaforums.com/t/y700-2023-regional-rom-flashing-guide.4685115/
2. Obtain stock vbmeta.img
   • Any version of vbmeta.img can be used.
3. Disable AVB.
   • Prepare fastboot drivers and platform-tools then, run the following command.

   fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img

4. Download recovery image from the release
5. Flash recovery
   • Run the following command.

   fastboot flash recovery twrp-downloaded-file-name.img

6. Reboot into recovery
   • Run the following command.

   fastboot reboot recovery

When not boot

• Make sure AVB is disabled by step 3.
• Try to flash boot or vendor_boot partition from stock ROM.

Supported features

Blocking checks

• Correct screen/recovery size
• Working Touch, screen
• Backup to internal/microSD
• Restore from internal/microSD
• reboot to system
• ADB

Medium checks

• update.zip sideload
  Not tested
• UI colors (red/blue inversions)
• Screen goes off and on
• F2FS/EXT4 Support, exFAT/NTFS where supported
  Not tested
• all important partitions listed in mount/backup lists
• backup/restore to/from external (USB-OTG) storage (not supported by the device)
• backup/restore to/from adb (https://gerrit.omnirom.org/#/c/15943/)
  Not tested
• decrypt /data
• Correct date

Minor checks

• MTP export
• reboot to bootloader
• reboot to recovery
• poweroff
• battery level
• temperature
• encrypted backups
  Not tested
• input devices via USB (USB-OTG) - keyboard, mouse and disks (not supported by the device)
• USB mass storage export
• set brightness
• vibrate
• screenshot
• partition SD card
  Not tested

Unchecked items are not working now.

Partition layout

• A/B
• Has super partition
• Has dedicated recovery partition (with A/B)
• Recovery doesn't include kernel (Use kernel from boot.img)
• No init_boot partition
• See the seciton Launch or upgrade to Android 12, dedicated and A/B recovery (dedicated ramdisk) from
  https://source.android.com/docs/core/architecture/partitions/generic-boot

Device specifications

Component	Model
SoC	Qualcomm SM8475P Snapdragon 8+ Gen 1 (4 nm)
CPU	Octa-core (1x3.19 GHz Cortex-X2 & 3x2.75 GHz Cortex-A710 & 4x1.80 GHz Cortex-A510)
GPU	Adreno 730
Memory	12GB / 16GB
Storage	256GB / 512GB
Battery	Li-Po 6550 mAh, non-removable
Display	1600 x 2560 pixels (144Hz 8.8" IPS LCD)
Latest Android Version	ZUI 16 (Android 14)

Build instructions

1. Initialize TWRP source

mkdir twrp-12.1
cd twrp-12.1
repo init --depth=1 -u https://github.com/minimal-manifest-twrp/platform_manifest_twrp_aosp.git -b twrp-12.1
mkdir -p .repo/local_manifests

2. Add this to .repo/local_manifests/TB320FC.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
	<project name="polygraphene/android_device_lenovo_TB320FC" path="device/lenovo/TB320FC" remote="github" revision="android-12.1"/>
</manifest>

3. Start downloading TWRP source

repo sync -j$(nproc)

4. Apply patches
   This step is required as of October 2024. Skip it if those patches are merged in the official repository. Those patches solve a problem with the bottom of the screen not showing properly.

cd bootable/recovery
git fetch https://gerrit.twrp.me/android_bootable_recovery refs/changes/83/7683/1 && git checkout FETCH_HEAD

5. Build TWRP

source build/envsetup.sh
lunch twrp_TB320FC-eng
mka -j$(nproc) recoveryimage

After the build has finished, you can find the recovery image at out/target/product/TB320FC/recovery.img.