The option installs DirectHW.kext and then runs the flashrom utility to read the flash chip and save it to file.
biosbackup.rom (the ROM file) and flashrom_log.txt (the log) are saved in the latest dump/BIOS/System folder.
The flashrom utility can do a lot more and is used for identifying, writing and erasing flash chips also. You can find more information at flashrom.org.
Source | Projectosx Forum Topic |
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Note | Root privileges are required to load the DirectHW.kext and run the flashrom tool. |