SanDisk Extreme SSD Firmware R211m download for for MacBook and MacBook Pros based on NVidia MCP79 chipset

That’s not what I was asking. I do have a USB key with the ISO installed on it, done on my PC with PowerISO but this seems not to work on the MAC. Another solution was to restore the image to the USB key using DiskUtility on the mac but the image needs to be verified to proceed which it cannot do because of no checksum available.