upgrade&cpu speedup = system hangup

After upgrade from 2.9rc6 to 2.9rc9 and frequency change to 333MHz system is not accessable using ether interface.
I have tried freq reset using S1 button - no result.

What should be done to resolve a problem?
The same upgrade was one on other side identically and everything worked OK (new version an frequency stayed changed)

You should write to support. The forum only provide community support.

John

already wrote, but as it was short after midnight Latvian time, then stillo only ticket confirmation.