Could You please send me the SN# of this device ?
Sorry, but this must be some kind of mistake, You can fix this, by updating your RouterOS to the latest version:
After rOS update, upgrade your BIOS to the latest possible version with command:
/system routerboard upgrade
You can change your CPU frequency with command:
/system routerboard settings set cpu-frequency=850MHz
After reboot, your router should work with 850Mhz frequency