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Before you flash

Which tool flashes your Xteink?

Unlocked X3 or X4? Use the web flasher. Locked X4? Use the OTA Unlocker. Locked X3? Use the SD card path. Already have a .bin and a terminal? esptool. Building from source? PlatformIO.

Open the matching guide

If the web flasher never sees your Xteink, stop and switch. Locked X4 uses the OTA Unlocker. Locked X3 can use the SD card path from stock.

Web flasher

~5 min Easy Unlocked X3 & X4

Start here on an unlocked X3 or X4. Desktop Chrome or Edge, a USB-C data cable, nothing to install.

Get the Web flasher steps

SD card

~5 min Easy X3 (locked or unlocked)

Locked X3 still on stock. Skip this on a locked X4 and open the OTA Unlocker.

Get the SD card steps

OTA Unlocker

~10 min Easy Locked X3 & X4

Locked X4, or a locked X3 over WiFi. CrossPoint and CrossInk only.

Get the OTA Unlocker steps

esptool

~10 min Technical Unlocked X3 & X4

Unlocked X3 or X4, Python on the machine, and a .bin you already chose.

Get the esptool steps

PlatformIO

~30–45 min Developer For contributors

Build or patch firmware. Not the path for a release install.

Get the PlatformIO steps

Owner kit

A light and a case after setup

X3 and X4 ship without a front light. A clip-on is the usual first add-on.

  • eReader Magnetic Reading Light

    eReader Magnetic Reading Light

    Official
    from $9.99
    Buy
  • X4 Pro Magnetic Case

    X4 Pro Magnetic Case

    Official
    $8.99
    Buy

Kit it on accessories .

Next: Still choosing a build? Firmware chooser. Already flashed? Plugins for fonts and themes, or the X4 book transfer guide for Calibre.

Verified August 24, 2026. Not affiliated with Xteink.