While official Haier websites typically offer single-file updates via their support pages, fragmented .rar files are common on community platforms:
Use a FAT32-formatted USB flash drive (preferably 8GB or smaller).
Search for the specific filename Haier_LE42U6500A_firmware_part04.rar on community-driven sites like Firmware.vip or specialized Telegram channels dedicated to LED TV software. How to Install the Firmware