R.I. Gen. Laws § 6A-9-624: Waiver.

(a) Waiver of disposition notification. A debtor or secondary obligor may waive the right to notification of disposition of collateral under § 6A-9-611 only by an agreement to that effect entered into and signed after default.

(b) Waiver of mandatory disposition. A debtor may waive the right to require disposition of collateral under § 6A-9-620(e) only by an agreement to that effect entered into and signed after default.

(c) Waiver of redemption right. Except in a consumer-goods transaction, a debtor or secondary obligor may waive the right to redeem collateral under § 6A-9-623 only by an agreement to that effect entered into and signed after default.