InkCase IVY updates itself automatically via the InkCase App in iOS App Store.
Launch InkCase App. Select 'My InkCase' tab and click on 'Update Firmware'. InkCase will automatically start downloading and installing the latest firmware. Make sure your iPhone is connected to an internet source.
If InkCase IVY is not detected, press and hold the Power Button (left button) for 15s. Follow on screen instructions to complete the firmware upgrade.