Hi, I'm quite fresh with ESPs having long history with Arduinos, AVRs, PICs and all kind of "old" (74XXXX/NExxx stuff). My first goal was replace all of my "Boat Automation" Mega2560+W5500 units with WT32-ETH01 hardware. I even did this to some units until I find ESP Easy offerin...

Well, It seems that the chip is programmed in Release Mode with Secure Boot V1, Flash Encryption and Fuse Write protection set. https://docs.espressif.com/projects/esp-idf/en/latest/esp32/security/flash-encryption.html#flash-enc-release-mode I'm giving up with original chip, going to replace it with...

DT-R008 Fuse summary espefuse.py v3.2 EFUSE_NAME (Block) Description = [Meaningful Value] [Readable/Writeable] (Hex Value) ---------------------------------------------------------------------------------------- Calibration fuses: BLK3_PART_RESERVE (BLOCK0): BLOCK3 partially served for ADC calibrati...

You can also try to flash a build from this pending PR: https://github.com/letscontrolit/ESPEasy/pull/3845 Those will have a new bootloader and the flash frequency is set to 40 MHz instead of 80 MHz. Tested pull/3845: esptool.exe --chip esp32 --port COM7 --baud 115200 write_flash 0x00000 ESPEasy\di...

Also after a power cycle? Eventually you have to get it to boot, as there is a 50/50 chance it will boot with the GPIO-0 in a high state. I assume you have flashed the "factory" build? You can also try to flash a build from this pending PR: https://github.com/letscontrolit/ESPEasy/pull/38...

TD-er wrote: ↑21 Feb 2022, 19:50 Maybe hard short circuit GPIO-0 and GND (or use a 470 Ohm resistor to be sure) and then power it on.
This will turn the ESP into flash mode for sure.

That's exactly what I did. Flash completes and you can even verify it. The problem is bring it alive after flashing.

iron wrote: ↑21 Feb 2022, 14:14 IO0 is used by LAN (RMII_RST) so I tend to believe my failed attempts are due to this

Need to check closer. Anyway, I'll have to pull IO0 down before flashing..

Ath wrote: ↑21 Feb 2022, 12:57 Does that error persist after a power-cycle? Sometimes the reboot doesn't work as intended

Sure, I power-cycled between all steps and afterwards.
Tried also flash simple Serial Hello World with Arduino IDE after blank_4MB but the problem persist.

Erase, blank_4MB.bin, factory.bin. Same problem.
esptool verify_flash passes ok.

I tried to flash ESP32_4M316k_ETH-factory.bin to DT-R008.
Now serial is loopping:
rst:0x10 (RTCWDT_RTC_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

Trying next with stronger 3.3V source..