diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index d8f72a37..96bcd89e 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -359,6 +359,14 @@ config MULTITHREADING
 
 config LOG_IMMEDIATE
 	default n if MULTITHREADING
+	default y
+
+config LOG_PROCESS_THREAD
+	default n # mcuboot has its own log processing thread
+
+# override USB device name
+config USB_DEVICE_PRODUCT
+	default "MCUBOOT"
 
 config UPDATEABLE_IMAGE_NUMBER
 	int "Number of updateable images"
diff --git a/boot/zephyr/boards/nrf52840_pca10056_big.overlay b/boot/zephyr/boards/nrf52840_pca10056_big.overlay
new file mode 100644
index 00000000..094a7a45
--- /dev/null
+++ b/boot/zephyr/boards/nrf52840_pca10056_big.overlay
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &boot_partition;
+/delete-node/ &slot0_partition;
+/delete-node/ &slot1_partition;
+
+&flash0 {
+	partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			boot_partition: partition@0 {
+				label = "mcuboot";
+				reg = <0x000000000 0x00010000>;
+			};
+			slot0_partition: partition@10000 {
+				label = "image-0";
+				reg = <0x000010000 0x000074000>;
+			};
+			slot1_partition: partition@75000 {
+				label = "image-1";
+				reg = <0x00084000 0x000074000>;
+			};
+	};
+};
diff --git a/boot/zephyr/main.c b/boot/zephyr/main.c
index e2e609fb..2fd80eef 100644
--- a/boot/zephyr/main.c
+++ b/boot/zephyr/main.c
@@ -44,6 +44,28 @@ const struct boot_uart_funcs boot_funcs = {
 #include <usb/class/usb_dfu.h>
 #endif
 
+#if defined(CONFIG_LOG) && !defined(CONFIG_LOG_IMMEDIATE)
+#ifdef CONFIG_LOG_PROCESS_THREAD
+#warning "The log internal thread for log processing can't transfer the log"\
+         "well for MCUBoot."
+#else
+#include <logging/log_ctrl.h>
+
+#define BOOT_LOG_STACK_SIZE 768
+#define BOOT_LOG_PROCESSING_INTERVAL 30 /* [ms] */
+
+/* log are processing in custom routine */
+K_THREAD_STACK_DEFINE(boot_log_stack, BOOT_LOG_STACK_SIZE);
+struct k_thread boot_log_thread;
+
+/* log processing need to be initalized by the application */
+#define ZEPHYR_BOOT_LOG_START() zephyr_boot_log_start()
+#endif /* CONFIG_LOG_PROCESS_THREAD */
+#else
+/* synchronous log mode doesn't need to be initalized by the application */
+#define ZEPHYR_BOOT_LOG_START() do { } while (false)
+#endif /* defined(CONFIG_LOG) && !defined(CONFIG_LOG_IMMEDIATE) */
+
 #ifdef CONFIG_SOC_FAMILY_NRF
 #include <hal/nrf_power.h>
 
@@ -175,6 +197,45 @@ static void do_boot(struct boot_rsp *rsp)
 }
 #endif
 
+#if defined(CONFIG_LOG) && !defined(CONFIG_LOG_IMMEDIATE) &&\
+    !defined(CONFIG_LOG_PROCESS_THREAD)
+/* The log internal thread for log processing can't transfer log well as has too
+ * low priority.
+ * Dedicated thread for log processing below uses highest application
+ * priority. This allows to transmit all logs without adding k_sleep/k_yield
+ * anywhere else int the code.
+ */
+
+/* most simple log processing theread */
+void boot_log_thread_func(void *dummy1, void *dummy2, void *dummy3)
+{
+    (void)dummy1;
+    (void)dummy2;
+    (void)dummy3;
+
+     log_init();
+
+     while (1) {
+             if (log_process(false) == false) {
+                    k_sleep(BOOT_LOG_PROCESSING_INTERVAL);
+             }
+     }
+}
+
+void zephyr_boot_log_start(void)
+{
+        /* start logging thread */
+        k_thread_create(&boot_log_thread, boot_log_stack,
+                K_THREAD_STACK_SIZEOF(boot_log_stack),
+                boot_log_thread_func, NULL, NULL, NULL,
+                K_HIGHEST_APPLICATION_THREAD_PRIO, 0,
+                BOOT_LOG_PROCESSING_INTERVAL);
+
+        k_thread_name_set(&boot_log_thread, "logging");
+}
+#endif/* defined(CONFIG_LOG) && !defined(CONFIG_LOG_IMMEDIATE) &&\
+        !defined(CONFIG_LOG_PROCESS_THREAD) */
+
 void main(void)
 {
     struct boot_rsp rsp;
@@ -184,6 +245,8 @@ void main(void)
 
     os_heap_init();
 
+    ZEPHYR_BOOT_LOG_START();
+
 #if (!defined(CONFIG_XTENSA) && defined(DT_FLASH_DEV_NAME))
     if (!flash_device_get_binding(DT_FLASH_DEV_NAME)) {
         BOOT_LOG_ERR("Flash device %s not found", DT_FLASH_DEV_NAME);
diff --git a/boot/zephyr/sample.yaml b/boot/zephyr/sample.yaml
index d486aac3..62518c1b 100644
--- a/boot/zephyr/sample.yaml
+++ b/boot/zephyr/sample.yaml
@@ -13,3 +13,8 @@ tests:
   sample.bootloader.mcuboot.usb_cdc_acm_recovery:
     tags: bootloader_mcuboot
     platform_whitelist:  nrf52840_pca10059
+  sample.bootloader.mcuboot.usb_cdc_acm_recovery_log:
+    extra_args: OVERLAY_CONFIG=./usb_cdc_acm_log_recovery.conf
+      DTC_OVERLAY=./boards/nrf52840_pca10056_big.overlay
+    platform_whitelist:  nrf52840_pca10056
+    tags: bootloader_mcuboot
diff --git a/boot/zephyr/serial_adapter.c b/boot/zephyr/serial_adapter.c
index e5ebfdb4..63dca025 100644
--- a/boot/zephyr/serial_adapter.c
+++ b/boot/zephyr/serial_adapter.c
@@ -22,7 +22,7 @@
 #include "bootutil/bootutil_log.h"
 #include <usb/usb_device.h>
 
-#ifdef CONFIG_UART_CONSOLE
+#if defined(CONFIG_BOOT_SERIAL_UART) && defined(CONFIG_UART_CONSOLE)
 #error Zephyr UART console must been disabled if serial_adapter module is used.
 #endif
 
diff --git a/boot/zephyr/usb_cdc_acm_log_recovery.conf b/boot/zephyr/usb_cdc_acm_log_recovery.conf
new file mode 100644
index 00000000..ae412fed
--- /dev/null
+++ b/boot/zephyr/usb_cdc_acm_log_recovery.conf
@@ -0,0 +1,16 @@
+CONFIG_LOG=y
+
+# The build won't fit on the partition allocated for it without size
+# optimizations.
+CONFIG_SIZE_OPTIMIZATIONS=y
+
+# Serial
+CONFIG_SERIAL=y
+CONFIG_UART_LINE_CTRL=y
+
+# MCUBoot serial
+CONFIG_MCUBOOT_SERIAL=y
+CONFIG_BOOT_SERIAL_CDC_ACM=y
+
+CONFIG_LOG_BACKEND_UART=y
+CONFIG_LOG_BACKEND_RTT=n