DEXP, Telefunken, Supra, Harper, Hyundai, and Yasin.
Because this specific "IRIS Backup rar" is likely a technician's dump from a working unit, you'll find it on specialized repair forums. Here are the most reliable spots to check: Download MS3663T PB751 1366x768 IRIS Backup rar
Often hosts free firmware downloads for various MS3663T configurations. DEXP, Telefunken, Supra, Harper, Hyundai, and Yasin
This is a very common "three-in-one" (Power + LED Driver + Main) Chinese chassis manufactured by CVTE. It’s widely used in budget-friendly LED TVs across several brands, including: Download MS3663T PB751 1366x768 IRIS Backup rar
Provides specific downloads for 1366x768 models.
While the board can support up to 1080p, many 32-inch models use the 1366x768 HD resolution you're looking for. 🛠️ Where to Download the Firmware