| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | | BootROM cannot find preloader signature (corrupt eMMC/NAND) | Check eMMC voltage (1.8V vs 3.3V) or re-ball eMMC chip. | | Brom error: 0xC0060005 (DRAM failed) | The 512m memory configuration mismatches your physical RAM density. | Verify RAM chip part number (e.g., K4T51163QJ vs K4T1G164QE). | | Boot loop at logo | The k80hd display driver in preloader conflicts with panel init sequence. | The panel needs a different reset/delay. Requires source code rebuild. | | SP Flash Tool: S_BROM_DOWNLOAD_DA_FAIL (0x7D4) | Preloader is locked to a different DA (Download Agent) version. | Use the DA file that came with the original factory firmware. |