Try this:
DOWNGRADE MAG250/MAG 254
On USB - drive, the file system FAT32, copy the file below on the root
If your STB MAG-200/250 several USB connectors then use to update the rear connector.
On a USB drive should the directory MAG250 that contain two files imageupdate and bootstrap
Enter The BIOS
How to enter the BIOS setup (bootloader menu) MAG-250?
Power off STB MAG200/250.
Press and hold the «menu» on the remote (or the power button on the front panel).
Without releasing the «menu» (or the power button on the front panel) Power on STB MAG/250.
Select “Upgrade Tools”, pressing enter on the remote control to the right
Select “USB Bootstrap”
Connect the USB flash drive and click OK to confirm the beginning of the update process
Wait for the update, STB will reboot.
Here You have firmware
http: //soft.infomir.com.ua/index