Official downloads for these specific legacy models are rare on manufacturer websites. Instead, they are frequently hosted on specialized technician forums and archival channels:
Forums such as KazmiElecom are primary sources for these rar files, which are often used when a TV is stuck on a logo or failing to boot. Installation Procedure Download L40B8550 MS35535 ZC01 rar
Primarily found in Haier and TCL models, such as the Official downloads for these specific legacy models are