Mac burn iso appendable7/6/2023 ![]() searching net and especially Ask Different for solutions.Neither a Windows PC, nor a Linux laptop can boot the sticks I prepared. Frustratingly, that indeed boots as intended, but can't update the device either. booting a fresh virtual machine on a Mac host with just the needed iso attached.writing to customer support (answer: "iso looks good, should work, please try again").using a different iso (not matching the target device) from the vendor site (works without any issues according to instructions, but can't update my deviceā¦).gparted and fdisk mkfs.vfat on a Linux machine.Windows on-board tools on a PC for re-formatting the sticks.different versions of DiskUtility (Sierra and Mojave). ![]() writing the iso file with dd directly to the stick (and in another round using Balena etcher and universal usb installer).partitioning the sticks to either MBR or GPT.erasing the sticks a few times with DiskUtility.The external USB-drive never shows up in the boot menu. What then doesn't work is booting a MacBook Pro 2015 from that stick. The instructions ( PDF) for a firmware update utility say to use Unetbootin on MacOS to write an iso-file to a FAT32 formatted (erased) USB stick. Goal is updating a NVMe SSD firmware on a Mac without optical drive via USB stick that should contain a minimal Linux, flasher and payload.
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