Release the button when the standby light starts flashing rapidly, indicating the update has started.
If software doesn't fix the issue, you can find the CV628H-B42 motherboard on specialty electronics sites like Kitbazar. Download CV628H B42 1366x768 Sony Flip (Ulta) part2 rar
Used as a replacement for failed mainboards in mid-range LCD displays from the early 2010s. Release the button when the standby light starts
Place the extracted file (usually named ctvupdate.bin or similar) into the root directory of the USB drive. Flash Process: Unplug the TV. Insert the USB drive. Hold the Power button on the TV panel and plug it back in. Download CV628H B42 1366x768 Sony Flip (Ulta) part2 rar
If your TV is stuck on the "Sony" logo or a "Flip" boot screen, a firmware re-flash is usually required. Installation Guide