Regarding steps 1 and 5: connect as shown by xbolshe.
Regarding the FVMAIN file? Did you build one yourself? Are you able to see the same picture as in step 9 from Intel® Galileo Boards and Kits — Recovery Mode ?
In this thread Re: How to recover after corrupted SPI flash. you can download the FVMAIN file for a Gen 1 in case you want to try with this file.
yes, i have a builded by myself one , but I used what you gave the download one.
I formated my USB and put the file FVMAIN.fv into it.
but it always black screen , I think it's interrupted the firmware update causing the unbootable.
and I want to do recovery step, but the usb host have the problem.
I have already connected it, but I find that my USB didn't work and the LED usb on the board didn't bright, either.
what should I do in the next step?
I think if the USB work,and I'll see the same picture as in the step 9