Watch the standby LED light on the front of the TV. Within 5 to 10 seconds, it should begin to . Once the rapid blinking starts, release the OK button.
The is a common chassis manufactured by Vestel. Because Vestel produces TVs for many different labels, the firmware isn't "one size fits all." The software must match your specific panel model (the screen itself) and the brand’s UI. Where to Find the 17MB130S Firmware Link 17mb130s firmware link
Disclaimer: Proceed with caution. Flashing firmware is done at your own risk. Watch the standby LED light on the front of the TV