diff --git a/util/flash_ec b/util/flash_ec
index d5e922b1da..cf4356f27e 100755
--- a/util/flash_ec
+++ b/util/flash_ec
@@ -513,6 +513,11 @@ fi
 if $(in_array "${BOARDS_STM32_PROG_EN[@]}" "${BOARD}"); then
 	servo_v2_VARS+=" prog_en"
 fi
+if [ "${CHIP}" = "npcx_uut" ] ; then
+	servo_v2_VARS+=" ${MCU}_boot_mode"
+	servo_micro_VARS+=" ${MCU}_boot_mode"
+	servo_v4_with_ccd_cr50_VARS+=" ccd_${MCU}_boot_mode ccd_keepalive_en"
+fi
 toad_VARS="${MCU}_uart_parity ${MCU}_uart_baudrate boot_mode"
 
 if $(in_array "${BOARDS_NPCX_INT_SPI[@]}" "${BOARD}"); then
@@ -944,6 +949,17 @@ function flash_npcx_uut() {
 	info "${MCU} UART pty : ${EC_UART}"
 	claim_pty ${EC_UART}
 
+	if [[ "${SERVO_TYPE}" =~ "ccd_cr50" ]] ; then
+		dut_control ccd_keepalive_en:on
+	fi
+
+	# Force the EC to boot in UART update mode
+	ec_enable_boot0
+	ec_reset
+
+	# Have to wait a bit for EC boot-up
+	sleep 0.1
+
 	# Remove the prefix "/dev/" because uartupdatetool will add it.
 	EC_UART=${EC_UART#/dev/}
 	MON_PARAMS="--port ${EC_UART} --baudrate 115200"