The TEAC DV-W524GS (fw BT11) can be crossflashed to a Lite-On iHAS524 A model.
Flash an unscrambled iHAS524 A firmware (either a .bin firmware file or one of C0deKing's .exe repackaged firmwares) using Flash Utility. Then use the Convert Drive function in the EEPROM Utility to fix the blinking LED issue and complete the crossflash. Shut down the computer. Done.
Make sure you backup both your firmware and your EEPROM before attempting the crossflash.