You might want to try another refresh and trying CPU Master to set the Mhz
As for the Blue light for me it is normally when my using is in nvflash mode. Try a hard power off to see if it goes away e.g. hold power for 5 seconds.
If still not gone then once fully powered off put it into nvflash mode and out again.
To do this press back for 1 sec then still holding back press power for 1 sec, then let go of power, wait another second and let go of back. Hence seq is lig
back + power 1 sec
back 1 sec
Let go of buttons
You should now be in nvflash mode, at this stage press power for 5 seconds to get out of it.