1. Download upgrade system file(update.zip) from forum,
2. Copy "update.zip" file to USB stick
3. Insert USB stick on USB slot
4. Move to Upgrade menu in ATV Settings
5. Move to Upgrade menu in ATV Settings
6. Move to "About" in ATV Settings
7. Move to "System Update" in ATV Settings
8. Select "Local upgrade" (Alternatively "upgrade online" if the firmware is not downloaded)
9.Choose your driver where you have "update.zip" file.
10.Select "OK" to upgrade
11. you can see "UPdt" on 7 Segment LED. 

12. Please wait till you are getting "boot" on 7 Segment LED
Firmware, downloads and support for U4 / U5 Quad Hybrid.
Your community resource for the U4 / U5 Quad Hybrid satellite receiver — firmware images, channel lists, plugins and setup help.
