Unable to update device cert

Final solution:

def set_management_cert(self, cert_name, key_name):

    self.run_bash_command(f'restorecon -RvF /config/httpd/conf/ssl.crt/{cert_name}')
    self.run_bash_command(f'restorecon -RvF /config/httpd/conf/ssl.key/{key_name}')

    self.session.put(
        f'https://{self.device}/mgmt/tm/sys/httpd',
        json={
            'sslCertfile': '/config/httpd/conf/ssl.crt/management.crt',
            'sslCertkeyfile': '/config/httpd/conf/ssl.key/management.key'}
    )
    try:
        logger.info('Restarting httpd')
        self.run_bash_command('bigstart restart httpd; killall -9 httpd;bigstart restart httpd;')
    except:
        logger.info('Waiting for management interface to restart')
        time.sleep(3)
        httpd_config = self.get_httpd_config()

        if os.path.basename(httpd_config['sslCertfile']) == cert_name \
                and os.path.basename(httpd_config['sslCertkeyfile']) == key_name:
            print('Certificate has been updated and the httpd interface is responding')
        else:
            raise Exception('Failed to update the certificate')

Thank you for the suggestions and tips Dario_Garrido . Definitely helped me find the solution!