I found Silent Boot worked fine for me before the GB update. Now I have to leave compatibilty mode checked off and it works again for restarts like when you hold the side button and choose restart.
It does not work for me after a battery pull. But if you know are going to pull the battery, then lower the volume key to vibrate "before" you pull the battery!
The only issue with keeping the compatibility checked off is there is a constant grey circle at the top left of your screen like a program notification update. I've searched and no one has any clue what compatibility mode even means.
Hopefully, Silent Boot's developer will update a fix for GB now. But it does work on the Charge as it is. I found that that thread about secret codes never worked for me even brefore the GB update.