Since this is a motherboard ID, you should look for "Stock ROM" or "Firmware" files on community-driven repositories.
through the recovery menu (usually accessed by holding Power + Volume Up) to see if it resolves your issue without the risk of a full firmware overwrite. Do you have the specific processor model (e.g., MT6580) or the name of the tablet to help narrow down a compatible file? zl782-mb-v2.1 firmware download