Looks like a continuous reset. Perhaps a pull up resistor on the Reset line.

Hai,

I didn't understand what you are telling, can you please elaborate?

No protection on 12v input?

Hai,
12v input is from SMPS. Which protection is needed?

Hai ESP_Angus,
This has happened to six to nine devices out of 148. At 115200bps I got 3 different results in nine devices.
In one device it is printing following message continuously.
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d ...

What is the environment that the device is deployed in? How is it enclosed? Could mositure damage or other harsh conditions be a possibility ?

Hai nevercast,
I am using IP65 box. Box will expose to sunlight. Inside box temperature is up to 55 degree Celsius and no moisture.

Hi,

I am using ESP32 Wroom in a product. After a month of operation the devices stops working. We find that the device does not boot. If I try to flash ESP32, I am getting the error following. The devices were purchased from a reputed online vendor.

esptool.py v2.3.1
Connecting ...