Problem with flash

[petrkoc]

Hello.

I am using Sparkfun ESP32 Thing with Arduino IDE, yesterday I was doing some I2C communication experiments. Suddenly the chip stopped receiving new programs - upload always halts with:

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esptool.py v2.1-beta1
Connecting........_____....._
Chip is ESP32D0WDQ6 (revision 0)
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 512000
Changed.
Configuring flash size...
Warning: Could not auto-detect Flash size (FlashID=0xffffff, SizeID=0xff), defaulting to 4MB
Compressed 8192 bytes to 47...

A fatal error occurred: Timed out waiting for packet content

The serial monitor shows:

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rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
Falling back to built-in command interpreter.
OK
>ets Jun  8 2016 00:22:57

There is no reaction to RST button but button 0 causes serial to show:

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rst:0x10 (RTCWDT_RTC_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
waiting for download

Running "esptool.py --chip esp32 --port COM17 erase_flash" does not fix the problem, result: "A fatal error occurred: Timed out waiting for packet content"

Running "esptool.py --chip esp32 --port COM17 flash_id" shows a problem with flash being unknown:

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esptool.py v2.2-dev
Connecting........___
Chip is ESP32D0WDQ6 (revision 0)
Uploading stub...
Running stub...
Stub running...
Manufacturer: ff
Device: ffff
Detected flash size: Unknown
Hard resetting...

Is there a way how to fix this or is the board dead? According to scheme the flash should be Winbond W25Q32FVSS - 4MB SPI Flash.

Thank you.

[ESP_Sprite]

Interesting - seems communication with the flash is dead. Did you happen to connect anything to the GPIO pins used by flash (GPIO6-11)?