The indicator light (usually red/blue) will start blinking rapidly. Do not turn off the power during this time.
While I can't host the actual .rar file here, I’ve put together a blog-style guide to help you find and install it safely. Download TSUMV59 T9C1 1366x768 HAIER rar
It sounds like you're looking for the specific firmware (software) for a using the TSUMV59 motherboard with a 1366x768 resolution. The indicator light (usually red/blue) will start blinking