No amendment or waiver of any provision of this Guaranty nor consent to any departure by any Guarantor herefrom shall in any event be effective unless the same shall be in writing, approved by the Required Lenders (or by all the Lenders where the approval of each Lender is required under the Credit Agreement) and signed by the Administrative Agent, and then such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.