> For the complete documentation index, see [llms.txt](https://support.ellipal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues.md).

# Device & Connection Issues

- [How to Fix NFC Connection Issues with the ELLIPAL X Card?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/how-to-fix-nfc-connection-issues-with-the-ellipal-x-card.md): Fix ELLIPAL X Card NFC connection issues with quick checks for phone case   interference, correct NFC placement, and card reset steps if scanning   still fails.
- [Why Is the App Scan Page Black?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/why-is-the-app-scan-page-black.md): The ELLIPAL App scan page shows a black screen because of a camera   permission issue or a glitched app cache, and reinstalling the app usually fixes it.
- [What Should I Do If My ELLIPAL Titan Won't Turn On?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/what-should-i-do-if-my-ellipal-titan-wont-turn-on.md): An ELLIPAL Titan device that won't turn on is usually caused by dirty   charging contacts, the wrong adapter, or too little charging time.
- [What Should I Do If the Firmware Update Fails?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/what-should-i-do-if-the-firmware-update-fails.md): If your device fails to update its firmware, follow this guide to fix common causes like SD card, adapter, and power connection issues.
- [How Do I Factory Reset My ELLIPAL Titan?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/how-do-i-factory-reset-my-ellipal-titan.md): Learn how to factory reset your ELLIPAL Titan safely, including important backup reminders and two methods to remove account data from your device.
- [How to Add BTC Taproot Address on Titan?](https://support.ellipal.com/docs/troubleshooting-and-support/device-and-connection-issues/how-to-add-btc-taproot-address-on-titan.md): After updating to firmware version 4.12.0 or later, you can enable and use BTC Taproot addresses on ELLIPAL Titan Series devices.