How to connect to XTEINK X4 from your smartphone or computer wirelessly to transfer books and more

In this tutorial I show you how to connect to your XTEINK X4 and X3 wirelessly to your smartphone or computer to change settings or transfer files and books. This works with Crosspoint firmware or any fork of it like CrossInk for example.

How to Wirelessly Connect and Transfer Books to Your XTEINK X4
If you are an avid reader who loves diving into e-books on a dedicated e-reader, knowing how to efficiently manage your digital library is essential. Managing physical cables to transfer EPUBs or PDFs can be a hassle, but thankfully, the XTEINK X4—running CrossPoint or a fork like CrossInk—offers powerful built-in wireless file transfer options.

In this tutorial, we will explore two distinct methods for wirelessly connecting a computer or smartphone directly to your XTEINK X4: Joining a Local Network and Creating a Hotspot.
Method 1: Join a Network (Local Area Network Transfer)
The first and generally easiest method assumes that both your XTEINK X4 and your transferring device are connected to the same local Wi-Fi network.
How it works technically: When you select this option, your e-reader initializes a lightweight HTTP web server on your Local Area Network (LAN). It opens a specific port, allowing other devices on the same subnet to resolve its local IP address or mDNS (Multicast DNS) hostname. This allows you to interact with the device’s file system remotely via a standard web interface, bypassing the need for dedicated file-transfer protocols like FTP.

Step-by-Step Instructions:

1. On your XTEINK X4, navigate to the File Transfer menu and select Join a Network.
   
2. The device will generate a server address and display a QR code.
   
3. Grab your mobile device, such as an iPhone Air, and open the camera app. Point it at the screen to scan the QR code.
   
4. Alternatively, you can manually type the provided numerical IP address into any web browser on your computer or phone, or use the convenient local hostname address: crosspoint.local.
   
5. Select "Open," and the Cross Sync web interface will load seamlessly in your browser.
   

From this web interface, you gain full administrative control over your e-reader. You can open the Settings panel to adjust and save system preferences, or navigate to the File Manager. Inside the File Manager, you will see your current reading library and folders.

To add a new book:

• Tap Upload, then select Choose Files.
  
• You can browse directly through your device's internal file manager or choose a cloud provider like Google Drive.
  
• Locate your book file, select it, and click upload.
  

Using this localized upload method is highly recommended for binary file KOReader syncing. By transferring the exact binary file structure rather than relying purely on superficial file name syncing, you ensure that the cryptographic hashes of your e-books match perfectly across devices. This guarantees that advanced metadata, reading progress, and annotations sync flawlessly.

Once you are done transferring, simply tap Exit on the e-reader to safely terminate the web server.

Method 2: Create a Hotspot (Ad-Hoc Wi-Fi Network)
What if you are completely off the grid? The second option, Create Hotspot, is the perfect solution for when you are out in the woods or traveling without access to a traditional Wi-Fi router.
How it works technically: Selecting this option turns the e-reader’s network interface card (NIC) into a Software-Enabled Access Point (Soft AP). It establishes its own localized ad-hoc Wireless Local Area Network (WLAN). This creates a direct, peer-to-peer (P2P) connection between the e-reader and your phone or computer. Because the routing is handled entirely locally between the two devices, absolutely no external internet connection or cellular data is required.

Step-by-Step Instructions:

1. On the XTEINK X4, select Create Hotspot.
   
2. The screen will display two separate QR codes.
   
3. Scan the first QR code with your phone. This code contains the SSID and cryptographic handshake credentials required to authenticate and connect your phone directly to the e-reader's newly broadcasted Wi-Fi network.
   
4. Once your phone confirms it has connected to that specific Wi-Fi network, scan the second QR code.
   
5. This will immediately open the file manager interface in your web browser, identical to the one used in Method 1.
   

From here, the process is exactly the same: you can upload new reading material, delete finished books, or adjust settings completely offline. It is an incredibly nifty feature that guarantees you can always sideload your next great read, regardless of internet availability.
When you are finished, tap Exit on the XTEINK X4 to shut down the hotspot and disconnect the local ad-hoc network. 

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