After an application for approval of a conversion has been approved and all conditions precedent to the conversion have been fulfilled, the commissioner shall approve the amendments to the articles of the converting depository corporation called for in Section 4922, endorse the approval on the certificate of amendment or other instrument containing the amendments, and specify the time at which the certificate of amendment or other instrument is to be filed with the Secretary of State. The certificate of amendment or other instrument shall be filed with the
Secretary of State at the time so specified by the commissioner, and at the time of the filing, the conversion shall become effective for all purposes.