(1) A debtor or secondary obligor may waive the right to notification of disposition of collateral under Section 70A-9a-611 only by an agreement to that effect entered into and authenticated after default.

(2) A debtor may waive the right to require disposition of collateral under Subsection 70A-9a-620(5) only by an agreement to that effect entered into and authenticated after default.

(3) Except in a consumer-goods transaction, a debtor or secondary obligor may waive the right to redeem collateral under Section 70A-9a-623 only by an agreement to that effect entered into and authenticated after default.