Updating this type of TV involves a "USB forced flash" because the TV usually cannot boot into a menu to select an update.
Since you asked to "prepare an essay," I have structured a brief analysis on the technical context and installation of this specific firmware. Technical Overview of Haier LE40B8000 Firmware Download LE40B8000 MSOV590 18275 rar
Extract the .rar file and copy the .bin file to the root directory of a FAT32-formatted USB drive. Execution: With the TV unplugged, insert the USB drive. Updating this type of TV involves a "USB
This likely refers to a specific build number or internal versioning code. Installation Process (Standard V59 Procedure) Execution: With the TV unplugged, insert the USB drive
The indicator light (LED) will typically blink rapidly during the process. Do not turn off the power until the blinking stops or the TV restarts. Risks and Verification