Mich. Comp. Laws § 440.9624: Waiver.

Sec. 9624.

A debtor or secondary obligor may waive the right to notification of disposition of collateral under section 9611 only by an agreement to that effect entered into and authenticated after default.

A debtor may waive the right to require disposition of collateral under section 9620(5) only by an agreement to that effect entered into and authenticated after default.

Except in a consumer-goods transaction, a debtor or secondary obligor may waive the right to redeem collateral under section 9623 only by an agreement to that effect entered into and authenticated after default.