Websites like CarAudioCentral , MP5Factory , or AliExpress sellers (where many Alpha Coustic units are sold) sometimes host firmware files. Only download from a seller with positive feedback and who confirms the file matches your hardware revision.
MP1769_V1.2.3_20230815 or AC-MP1769-MCU-2.1
7-inch capacitive multi-touch with 1024x600 resolution. How to Find the Correct Firmware Download