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: Some updates may reset your custom picture or network settings to factory defaults; take a photo of your settings before starting.
After powering back on, verify the new firmware version: v8r851t02lf1 firmware better
Copy the file directly to the root of the USB drive (do not put it in a folder). Install: Plug the USB into the TV. Go to Settings > System > System Update > Local Update . The TV will scan the USB and begin the process. 4. Critical Safety Tips : Some updates may reset your custom picture
Auto-negotiation failure due to cable mismatch. Fix: Force 1Gbps or 2.5Gbps manually via ethtool -s eth0 speed 2500 duplex full autoneg off . The new firmware holds manual settings across reboots, unlike older versions. Go to Settings > System > System Update > Local Update
: TCL typically does not provide a direct public download for these beta versions on their official website. Most users obtain them through community-managed OneDrive folders or by contacting TCL support directly.