: Boards such as Remont-AUD or Lab-Z often provide direct links to firmware, though they may require a free account or a simple technical quiz to download.
: Sites like Kazmi Elecom or Allandsoft frequently host multi-part RAR archives for these specific boards. Search their databases for "TP.MS358.PB818" to find the split files.
Android smart TV mainboards. These files are typically hosted on specialized technician forums or firmware repositories rather than official manufacturer sites.