No amendment to or waiver of any provision of this Guaranty nor consent to any departure by any Guarantor from its obligations under this Guaranty shall in any event be effective unless the same shall be in writing and signed by the Administrative Agent (on behalf of the Lenders or the Required Lenders, as the case may be, pursuant to Section 10.1 of the First Lien Credit Agreement) and such Guarantor and then such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.