  <label>Upgrade</label>
                    <input name="filename" type="text" readonly>
                    <span class="pure-form-message">The device has <span data-key="free_size">?</span> bytes available for OTA updates. If your image is larger than this consider doing a <a href="https://github.com/xoseperez/espurna/wiki/TwoStepUpdates"><strong>two-step update</strong></a>.</span>
                </div>

                <div class="pure-controls">
                    <div class="pure-u-1 pure-u-lg-1"><