: A full EMMC firmware dump for the Panda 55-inch 4K model is available on RepairAllTV. This requires an EMMC programmer (like the TNM5000 or RT809H) to flash.
You can find firmware and technical documentation for this board at the following sources: Google Drive Link: A community-shared firmware file is hosted on Google Drive KenotronTV: tpsk706spc822 firmware link