S.C. Code § 33-37-260
The charter may be amended by the votes of the stockholders and the members of the corporation voting separately by classes. The amendments require approval by the affirmative vote of two-thirds of the votes to which the stockholders are entitled and two-thirds of the votes to which the members are entitled. Provisions of the charter setting forth the classes and authorized shares of stock of the corporation may be amended by the affirmative vote of a majority of the votes to which the stockholders are entitled. If the charter so provides, the board of directors shall have the authority to set the terms of a class or series of stock as provided by Section 33-6-102. No amendment of the charter which is inconsistent with the general purposes expressed in this chapter or which eliminates or curtails the right of the Secretary of State to examine the corporation or the obligation of the corporation to make reports as provided by law may be made without amendment of this chapter. No amendment of the charter which increases the obligation of a member to make loans to the corporation, makes a change in the principal amount, interest rate, or maturity date or in the security or credit position of an outstanding loan of a member to the corporation, affects a member's right to withdraw from membership as provided in Section 33-37-430, or affects a member's voting rights as provided in Sections 33-37-440 and 33-37-450 may be made without the consent of each member affected by the amendment.
S.C. Code § 33-37-260