The-Borrower-agrees-and-consents-to-be-bound-by-the-terms-and-conditions-of-this-Facility-Letter-notwithstanding-any-of-them-not-being-bound-by-this-Facility-Letter-or-any-agreement-or-document-whether-as-a-result-of-any-failure-to-execute-or-any-def

In this sentence, "want of the necessary powers" refers to a situation where the borrower lacks the legal authority or power to enter into the agreement, whether due to a legal restriction, lack of capacity, or any other reason. The sentence is stating that even if the borrower does not have the necessary powers to enter into this agreement, they still agree to be bound by its terms and conditions.