ESP32 Forum

Posted: **Thu May 31, 2018 11:55 am**

Hi everybody,

I follow the guide "ESP32_Certification_and_Test_Guide__EN.pdf" to put the ESP32 into FCC Certification mode. After flashing the module then rebooting it, it is stuck into a reboot loop :

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:QIO, clock div:2
load:0x40080000,len:172476
1162 mmu set 00010000, pos 00010000
1162 mmu set 00020000, pos 00020000
ho 0 tail 12 room 4
load:0xffffffff,len:-177
ets Jun 8 2016 00:22:57

The second block is repeated infinitely.

My hardware is an ESP32-DevKitC and I flashed the module with ESP32 DOWNLOAD TOOL V3.6.3

Anyone get an idea ?

Posted: **Fri Jun 01, 2018 12:53 am**

Are you sure your ESP32 gets enough juice? Sometimes anemic USB cables can lead to issues like this. When in doubt, you can use a 5V lab power supply to power the board.

Posted: **Fri Jun 01, 2018 1:05 am**

Hi j.mouton,

Try flashing the image with "--flash_mode dio" (if using esptool.py), or set DIO mode (rather than QIO mode) in the Windows flasher tool.

Angus

Posted: **Fri Jun 01, 2018 7:14 am**

you can use a 5V lab power supply to power the board.

I've tried but the result is the same.

Try flashing the image with "--flash_mode dio" (if using esptool.py), or set DIO mode (rather than QIO mode) in the Windows flasher tool.

It was already my configuration as you can see on the picture :

https://imgur.com/a/iLrNnyN

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