Features built-in WiFi and an RJ45 connector for internet. Understanding the File Name HV553 PC821: The specific model number of the motherboard.
Likely refers to the Refresh Rate (possibly 60Hz or a specific 90Hz reference used by technicians) or a specific firmware revision. Download HV553 PC821 3840x2160 Ref90 Pakistan part01 rar
The standby light should begin , indicating the software update has started. Do not turn off the power during this process. Features built-in WiFi and an RJ45 connector for internet