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diff --git a/include/libimobiledevice/preboard.h b/include/libimobiledevice/preboard.h
new file mode 100644
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+++ b/include/libimobiledevice/preboard.h
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+/**
+ * @file libimobiledevice/preboard.h
+ * @brief Service to 'preboard' a device, which allows to ask for passcode during firmware updates.
+ * \internal
+ *
+ * Copyright (c) 2019 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef IPREBOARD_H
+#define IPREBOARD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libimobiledevice/libimobiledevice.h>
+#include <libimobiledevice/lockdown.h>
+
+#define PREBOARD_SERVICE_NAME "com.apple.preboardservice_v2"
+
+/** Error Codes */
+typedef enum {
+        PREBOARD_E_SUCCESS         =  0,
+        PREBOARD_E_INVALID_ARG     = -1,
+        PREBOARD_E_PLIST_ERROR     = -2,
+        PREBOARD_E_MUX_ERROR       = -3,
+        PREBOARD_E_SSL_ERROR       = -4,
+        PREBOARD_E_NOT_ENOUGH_DATA = -5,
+        PREBOARD_E_TIMEOUT         = -6,
+        PREBOARD_E_OP_IN_PROGRESS  = -10,
+        PREBOARD_E_UNKNOWN_ERROR   = -256
+} preboard_error_t;
+
+typedef struct preboard_client_private preboard_client_private;
+typedef preboard_client_private *preboard_client_t; /**< The client handle. */
+
+/** Reports the status response of the given command */
+typedef void (*preboard_status_cb_t) (plist_t message, void *user_data);
+
+/**
+ * Connects to the preboard service on the specified device.
+ *
+ * @param device The device to connect to.
+ * @param service The service descriptor returned by lockdownd_start_service.
+ * @param client Pointer that will point to a newly allocated
+ *     preboard_client_t upon successful return. Must be freed using
+ *     preboard_client_free() after use.
+ *
+ * @return PREBOARD_E_SUCCESS on success, PREBOARD_E_INVALID_ARG when
+ *     client is NULL, or an PREBOARD_E_* error code otherwise.
+ */
+preboard_error_t preboard_client_new(idevice_t device, lockdownd_service_descriptor_t service, preboard_client_t * client);
+
+/**
+ * Starts a new preboard service on the specified device and connects to it.
+ *
+ * @param device The device to connect to.
+ * @param client Pointer that will point to a newly allocated
+ *     preboard_client_t upon successful return. Must be freed using
+ *     preboard_client_free() after use.
+ * @param label The label to use for communication. Usually the program name.
+ *  Pass NULL to disable sending the label in requests to lockdownd.
+ *
+ * @return PREBOARD_E_SUCCESS on success, or a PREBOARD_E_* error
+ *     code otherwise.
+ */
+preboard_error_t preboard_client_start_service(idevice_t device, preboard_client_t * client, const char* label);
+
+/**
+ * Disconnects a preboard client from the device and frees up the
+ * preboard client data.
+ *
+ * @param client The preboard client to disconnect and free.
+ *
+ * @return PREBOARD_E_SUCCESS on success, PREBOARD_E_INVALID_ARG when
+ *     client is NULL, or a PREBOARD_E_* error code otherwise.
+ */
+preboard_error_t preboard_client_free(preboard_client_t client);
+
+/**
+ * Sends a plist to the service.
+ *
+ * @param client The preboard client
+ * @param plist The plist to send
+ *
+ * @return PREBOARD_E_SUCCESS on success,
+ *  PREBOARD_E_INVALID_ARG when client or plist is NULL,
+ *  or a PREBOARD_E_* error code on error
+ */
+preboard_error_t preboard_send(preboard_client_t client, plist_t plist);
+
+/**
+ * Receives a plist from the service.
+ *
+ * @param client The preboard client
+ * @param plist Pointer to a plist_t what will be set to the received plist
+ *
+ * @return PREBOARD_E_SUCCESS on success,
+ *  PREBOARD_E_INVALID_ARG when client or plist is NULL,
+ *  PREBOARD_E_TIMEOUT when no data was received after 5 seconds,
+ *  or a PREBOARD_E_* error code on error
+ */
+preboard_error_t preboard_receive(preboard_client_t client, plist_t * plist);
+
+/**
+ * Receives a plist from the service with the specified timeout.
+ *
+ * @param client The preboard client
+ * @param plist Pointer to a plist_t what will be set to the received plist
+ *
+ * @return PREBOARD_E_SUCCESS on success,
+ *  PREBOARD_E_INVALID_ARG when client or plist is NULL,
+ *  PREBOARD_E_TIMEOUT when no data was received after the given timeout,
+ *  or a PREBOARD_E_* error code on error.
+ */
+preboard_error_t preboard_receive_with_timeout(preboard_client_t client, plist_t * plist, uint32_t timeout_ms);
+
+/**
+ * Tells the preboard service to create a stashbag. This will make the device
+ * show a passcode entry so it can generate and store a token that is later
+ * used during restore.
+ *
+ * @param client The preboard client
+ * @param manifest An optional manifest
+ * @param status_cb Callback function that will receive status and error messages.
+ *   Can be NULL if you want to handle receiving messages in your own code.
+ * @param user_data User data for callback function or NULL.
+ *
+ * @return PREBOARD_E_SUCCESS if the command was successfully submitted,
+ *  PREBOARD_E_INVALID_ARG when client is invalid,
+ *  or a PREBOARD_E_* error code on error.
+ */
+preboard_error_t preboard_create_stashbag(preboard_client_t client, plist_t manifest, preboard_status_cb_t status_cb, void *user_data);
+
+/**
+ * Instructs the preboard service to commit a previously created stashbag.
+ *
+ * @param client The preboard client to use for receiving
+ * @param manifest An optional manifest
+ * @param status_cb Callback function that will receive status and error messages
+ *   Can be NULL if you want to handle receiving messages in your own code.
+ * @param user_data User data for callback function or NULL.
+ *
+ * @return PREBOARD_E_SUCCESS if the command was successfully submitted,
+ *  PREBOARD_E_INVALID_ARG when client is invalid,
+ *  or a PREBOARD_E_* error code on error.
+ */
+preboard_error_t preboard_commit_stashbag(preboard_client_t client, plist_t manifest, preboard_status_cb_t status_cb, void *user_data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif