You cannot download firmware based on screen size alone. To get the correct file, you need your and Project ID . Method 1: Check the sticker on the back of your TV.
Search for "TCL Android TV Firmware" on XDA. Many developers maintain threads with mirrors to Google Drive and MediaFire containing older versions if you need to "downgrade" for better performance. List of Common TCL Platforms
Use a drive smaller than 32GB and format it to FAT32 .
Go to Settings > Device Preferences > About > System Update. Select and choose the file on your USB. ⚠️ Critical Safety Warning
These are used for incremental updates. You install them via the TV menu without losing your apps or settings.
Once you have downloaded the file (usually a large .zip or .img file), follow these steps:
TCL does not always host every version on a public-facing website, so enthusiasts and official support channels are the best sources: 1. Official TCL Support Pages (Regional)