Install on Mac: Download image, and "open" it (dmg will mount it), and the x11 will be started with the iamge "770flasher.app". Open Finder, go to Applications, Utilities. Drag the 770flasher from the X11 window to the Utilities folder. I also use the N900 flasher, and use then a shell script in the Terminal. But this is better but takes more time. Beware that any error messages are on the Console. E.g. if the Flasher returns "SD emory not ready" it is the Eemc that is to slow - not your USB port or the SD memory on the N900. This is a HW timing bug and is shown on Mac, maybe Linux - but Windwos does not capture this, XP, Vista or 64bit 8 or 10. Unix signalling traps the bug and this is not implemented in Windows.