ASUS no longer actively supports many optical drives on their main website. Official sources:
If a firmware update file (typically a .exe or a zipped utility) is available: DRW-24D5MT - Support asus drw 24d5mt firmware update
If the drive disappears from File Explorer after the flash: ASUS no longer actively supports many optical drives
Most firmware updates for this model come as an executable file (.exe). asus drw 24d5mt firmware update