"Your device has been configured for Dolby Atmos. HP does not support this configuration. To restore factory audio, uninstall SP148273."
The download wasn't an installer. It was a .CAB file — a Windows cabinet archive. He extracted it. Inside: firmware blobs, an INF file, and a single, unmarked text file called README - DO NOT DELETE.txt . dolby atmos driver for windows 11 64-bit hp LINK