I downloaded this file
http://soft.infomir.com/mag256/release/2.20.03/imageupdate
and saved it on my USB stick in a folder called mag256.
Downgrade imageupdate:
1. Connect prepared USB-drive to STB.
2. Enter the System Recovery Utility menu :
a. Power off (unplug the power supply) STB.
b. Push and hold Menu button on RC and power STB on (still Holding Menu button, plug in power supply).
c. Wait for (~10 seconds) System Recovery Utility menu.
Release Menu button.
3. Select Upgrade Tools ⇒ Upgrade Software ⇒ Using USB ⇒ Yes; and select your file.
4. Wait until the update process is complete. The info about software update status is displayed in the bottom of screen.
When the software is updated the STB will automatically reboot.
Note: the Menu botton on RC is located on the left hand side below the down button and above the Vol+ button. The one with the 3 lines and 3 dots.
Good luck