Repossessions: Section 9-624. Waiver.
(a) [Waiver of disposition notification.] A debtor or secondary obligor may waive the right to notification of disposition of collateral under Section 9-611 only by an agreement to that effect entered into and authenticated after default.
(b) [Waiver of mandatory disposition.] A debtor may waive the right to require disposition of collateral under Section 9-620(e) only by an agreement to that effect entered into and authenticated after default.