Hello... Did you remove your battery Too? as this is required. Yes, the default programing will be restored.
Your memory may be ready to go 2133... But are the other components on your MB and CPU able to do this. The Speed and Frequency of Digital communication, must be syncronized and maintained between all your hardware... in other words don't keep trying to force a Number into your MB that will not Sync well with your other parts, if my computer Turns on day after day, that is all that is important to me.
Your memory is a just a slave to your memory controller, it is not the driving force that dictates the communication mode and speed.