Always read and save your original (corrupted) chip data before overwriting it.
You cannot install a .bin dump via USB. You need a programmer like the RT809F or CH341A to write the data directly to the chip. Where to Find the Download Download DUMP GEANT LED 42GN868BJUG7 820 13730LS0D 6500M rar
Since these are technician-level files, they are rarely on official websites. You will likely find them on specialized firmware forums: Always read and save your original (corrupted) chip