Files

purpl c87557d537 fix: correct zip root path and add idempotent build.prop append

- Fix ZIPROOT path from 3 to 4 levels up (../../../../)

- Add path validation before install

- Replace simple cat append with key-based dedup for build.prop (skips existing keys to prevent duplication on re-flash)

- Update AGENTS.md and README.md to reflect the changes

2026-07-03 11:29:20 +08:00

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CB-C6s-STU GSI Fixes

TWRP flashable zip that applies device-specific fixes for the CB-C6s-STU tablet when running a Generic System Image (GSI). All build.prop changes are appended — the existing file is never replaced.

What it fixes

Area	File	Problem	Fix
System properties	`build.prop`	Missing tablet characteristics, wrong brightness range, portrait-only orientation, broken Bluetooth A2DP offload	Append missing properties
Touchscreen	`goodix_ts.idc`	Touch orientation and input device type not declared	Install IDC config for Goodix touch panel
Camera sensors	`sensor_config.xml`	Rear/front camera sensor modules not configured	Install sensor config for hi846 / gc8034 modules

Files

CB-C6s-STU-GSI-Fixes.zip
├── META-INF/com/google/android/
│   ├── update-binary        # Shell script — all install logic
│   └── updater-script       # Placeholder (TWRP uses shell-script mode)
├── system/
│   ├── build.prop           # Properties appended to /system/build.prop
│   └── usr/idc/
│       └── goodix_ts.idc    # Touchscreen input device config
└── vendor/etc/
    └── sensor_config.xml    # Camera sensor module mapping

build.prop entries

Appended to the device's existing /system/build.prop:

# Tablet characteristics
ro.build.characteristics=tablet

# Workaround: Set max brightness of sprd_backlight to 1023
persist.sys.qcom-brightness=1023

# Workaround: Set primary display orientation to landscape
ro.surface_flinger.primary_display_orientation=ORIENTATION_90

# Workaround: Disable Bluetooth A2DP offload
ro.bluetooth.a2dp_offload.supported=false
persist.bluetooth.a2dp_offload.disabled=true

A backup is saved to /system/build.prop.bak before appending.

Usage

Copy CB-C6s-STU-GSI-Fixes.zip to the device (sdcard or adb push).
Boot to TWRP Recovery.
Tap Install → select the zip → Swipe to confirm Flash.
Reboot.

The script mounts /system and /vendor automatically. No manual mounting is needed.

TWRP install output

During flash, TWRP will show:

[1/3] Appending entries to /system/build.prop...
[2/3] Installing goodix_ts.idc...
[3/3] Installing sensor_config.xml...

Compatibility

Device: CB-C6s-STU tablet (Spreadtrum / Unisoc platform)
Recovery: TWRP with /sbin/sh support (shell-script update-binary)
GSI: Any Android GSI that needs these device-specific tweaks

Notes

The build.prop entries are appended with dedup — each property key (key=value) is only added if the key does not already exist in /system/build.prop. Re-flashing the zip multiple times is safe and will not duplicate entries.
The sensor_config.xml covers four camera sensor combinations: rear (hi846, gc8034_rear) and front (hi846_front, gc8034), each with OTP EEPROM tuning parameters.
For SAR (System-as-Root) devices, the script falls back to /system/vendor/etc/ if /vendor/etc/ is not available.

License

Provided as-is for device maintenance. No warranty.

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