[Arduino IDE demo source code for KC868-A8]--#11-Ethernet_Web server_code

[fiswany]

Hi
after flashing the firmware, i got below error:

10:27:18.702 -> ets Jul 29 2019 12:21:46
10:27:18.702 ->
10:27:18.702 -> rst:0x3 (SW_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
10:27:18.702 -> configsip: 0, SPIWP:0xee
10:27:18.733 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
10:27:18.733 -> mode: DIO, clock div:2
10:27:18.733 -> load:0x3fff0030,len:6656
10:27:18.733 -> load:0x40078000,len:15052
10:27:18.733 -> load:0x40080400,len:3836
10:27:18.733 -> entry 0x4008069c
10:27:18.733 -> I (52) boot: ESP-IDF v4.4.7-dirty 2nd stage bootloader
10:27:18.733 -> I (53) boot: compile time 12:46:57
10:27:18.733 -> I (53) boot: Multicore bootloader
10:27:18.767 -> I (57) boot: chip revision: v3.1
10:27:18.767 -> I (61) boot.esp32: SPI Speed      : 40MHz
10:27:18.767 -> I (65) boot.esp32: SPI Mode      : DIO
10:27:18.767 -> I (70) boot.esp32: SPI Flash Size : 4MB
10:27:18.767 -> I (75) boot: Enabling RNG early entropy source...
10:27:18.767 -> I (80) boot: Partition Table:
10:27:18.767 -> I (84) boot: ## Label            Usage          Type ST Offset  Length
10:27:18.799 -> I (91) boot:  0 nvs              WiFi data        01 02 00009000 00026000
10:27:18.799 -> I (98) boot:  1 phy_init        RF data          01 01 0003f000 00001000
10:27:18.799 -> I (106) boot:  2 factory          factory app      00 00 00040000 003b0000
10:27:18.799 -> I (113) boot: End of partition table
10:27:18.799 -> E (118) esp_image: image at 0x40000 has invalid magic byte (nothing flashed here?)
10:27:18.832 -> E (126) boot: Factory app partition is not bootable
10:27:18.832 -> E (131) boot: No bootable app partitions in the partition table
10:27:18.832 -> ets Jul 29 2019 12:21:46

your support is highly appreciated.