@Sheypooor: Yes you can. Just follow the installation instructions (here, posting 20). You may have to install a different boot loader.
@chaban: Although I do not have a HS7420 to test with, the image is built in exactly the same way as with the very similar HS7110 and HS7810A, which I can and have tested. Please note that boot from USB is VERY critical on these receivers; you may have to try several USB sticks to find one that works. Older ones (capacity < 1Gbyte) usually work best. I my household out of more than 20 sticks, only one works reliable, and one requires several restarts to boot. The problem is in the bootloader. As I do not have the source code of it, I cannot fix this.
Regards,
Audioniek.