c87557d537
- 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
92 lines
3.1 KiB
Markdown
92 lines
3.1 KiB
Markdown
# CB-C6s-STU GSI Fixes
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TWRP flashable zip that applies device-specific fixes for the **CB-C6s-STU**
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tablet when running a Generic System Image (GSI). All `build.prop` changes
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are **appended** — the existing file is never replaced.
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## What it fixes
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| Area | File | Problem | Fix |
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|------|------|---------|-----|
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| System properties | `build.prop` | Missing tablet characteristics, wrong brightness range, portrait-only orientation, broken Bluetooth A2DP offload | Append missing properties |
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| Touchscreen | `goodix_ts.idc` | Touch orientation and input device type not declared | Install IDC config for Goodix touch panel |
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| Camera sensors | `sensor_config.xml` | Rear/front camera sensor modules not configured | Install sensor config for hi846 / gc8034 modules |
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## Files
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```
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CB-C6s-STU-GSI-Fixes.zip
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├── META-INF/com/google/android/
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│ ├── update-binary # Shell script — all install logic
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│ └── updater-script # Placeholder (TWRP uses shell-script mode)
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├── system/
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│ ├── build.prop # Properties appended to /system/build.prop
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│ └── usr/idc/
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│ └── goodix_ts.idc # Touchscreen input device config
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└── vendor/etc/
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└── sensor_config.xml # Camera sensor module mapping
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```
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### build.prop entries
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Appended to the device's existing `/system/build.prop`:
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```ini
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# Tablet characteristics
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ro.build.characteristics=tablet
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# Workaround: Set max brightness of sprd_backlight to 1023
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persist.sys.qcom-brightness=1023
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# Workaround: Set primary display orientation to landscape
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ro.surface_flinger.primary_display_orientation=ORIENTATION_90
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# Workaround: Disable Bluetooth A2DP offload
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ro.bluetooth.a2dp_offload.supported=false
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persist.bluetooth.a2dp_offload.disabled=true
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```
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A backup is saved to `/system/build.prop.bak` before appending.
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## Usage
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1. Copy `CB-C6s-STU-GSI-Fixes.zip` to the device (sdcard or adb push).
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2. Boot to **TWRP Recovery**.
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3. Tap **Install** → select the zip → **Swipe to confirm Flash**.
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4. Reboot.
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The script mounts `/system` and `/vendor` automatically. No manual
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mounting is needed.
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## TWRP install output
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During flash, TWRP will show:
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```
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[1/3] Appending entries to /system/build.prop...
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[2/3] Installing goodix_ts.idc...
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[3/3] Installing sensor_config.xml...
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```
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## Compatibility
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- **Device**: CB-C6s-STU tablet (Spreadtrum / Unisoc platform)
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- **Recovery**: TWRP with `/sbin/sh` support (shell-script update-binary)
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- **GSI**: Any Android GSI that needs these device-specific tweaks
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## Notes
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- The `build.prop` entries are **appended with dedup** — each property key
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(`key=value`) is only added if the key does not already exist in
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`/system/build.prop`. Re-flashing the zip multiple times is safe and
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will **not** duplicate entries.
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- The `sensor_config.xml` covers four camera sensor combinations:
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rear (`hi846`, `gc8034_rear`) and front (`hi846_front`, `gc8034`),
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each with OTP EEPROM tuning parameters.
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- For SAR (System-as-Root) devices, the script falls back to
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`/system/vendor/etc/` if `/vendor/etc/` is not available.
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## License
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Provided as-is for device maintenance. No warranty.
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