Successfully flashed micropython doesn'r run

[bristol406]

I am trying to flash micropython onto an ESP32R4 relay controller module. The esp32 chip is labeled as ESP32 WROVER-B. The flashing process
completes successfully

---

E:\MicroPython>esptool.py --port com3 --baud 115200 write_flash --flash_size=detect 0 e:\Micropython\esp32-20220618-v1.19.1.bin
esptool.py v3.1
Serial port com3
Connecting...
Device PID identification is only supported on COM and /dev/ serial ports.
..
Detecting chip type... ESP32
Chip is ESP32-D0WD (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 4c:75:25:48:b5:00
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 16MB
Flash will be erased from 0x00000000 to 0x0017dfff...
Compressed 1560976 bytes to 1029132...
Wrote 1560976 bytes (1029132 compressed) at 0x00000000 in 90.9 seconds (effective 137.3 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

E:\MicroPython>

but when I reboot the board I get the error:

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

I have tried the following versions of micropython firmware from micropython.org but get the same effect:

esp32-20220618-v1.19.1.bin

ESP32_GENERIC-20230426-v1.20.0.bin

I have tried erasing the flash before flashing micropython but that made no difference. As a test I flashed Tasmota firmware to the board and that did run successfully.

Any guidance would be appreciated.

[robert-hh]

You can ignore the flash read err. That is common to all WROVER devices. You can use the firmware versions with SPIRAM, but the ones without SPIRAM should work as well. Which terminal emulator do you use?

[bristol406]

I'm using Putty terminal emulator which has worked on previous projects. I can try another if you have a suggestion.

[bristol406]

That's on Windows 10 PC

[glenn20]

E:\MicroPython>esptool.py --port com3 --baud 115200 write_flash --flash_size=detect 0 e:\Micropython\esp32-20220618-v1.19.1.bin

try this instead:

esptool.py --port com3 --baud 115200 --flash_size=detect write_flash -z 0x1000 e:\Micropython\esp32-20220618-v1.19.1.bin 

The firmware files for orig esp32 devices should be written to an offset of 0x1000. The -z option says to use compression so ir flashes a bit quicker (see https://micropython.org/download/ESP32_GENERIC/). You should also be able to use a faster baud rate.

[bristol406]

Yes, many thanks, that worked. I had to erase the flash first - probably a good idea anyway. You've saved me some hours of head scratching, thanks again.