Go debug that first then. If you do not see that download message, flash isn't going to work. Simply keep a terminal open, GPIO0 connected to ground, and swap anything you think may be the issue (bad DuPont wires, bad power supply, ...) until you see that message again, and it appears consistently ...

ESP_Sprite wrote: ↑

Wed Oct 20, 2021 1:08 am

Just to verify - if you connect a serial terminal program (like Putty) to the serial port and reset into download mode like that, do you see the ESP32 going into download mode properly each and every time? No corruption in the message it spits out?

Just saw it once and after that nothing.

ESP_Sprite wrote: ↑

Tue Oct 19, 2021 8:20 am

Sounds like your hardware is still marginal somehow. How do you put the ESP32 into download mode, by the way?

Flash mode-
GPIO0 ---GND to keep it low
EN(BUTTON) --- ONE TIME PRESS

or sometimes keep continuing pressing the EN until IDE shows connecting... & then release it. Both works for me.

Below is the schematics attached. Power is 3.10v on all the required pins. Check your power supply. An AMS1117 is not supposed to output as low as 3.1V. You should see a healthy 3.3V (or very close to it) on all relevant pins. Thanks for reply. Power has been improved. But the condition remains sam...

I can't tell anything more from half schematics and pictures that seem to be made in different setups. I'd suggest you triple-check the power supply, though; that's the thing that most consistently seems to give people issues. Thanks for your reply. Tried many things, but just nothing happened. The...

...U4 is not in your schematic? Can you send the *actual* schematic you're having issues with? U4 is just serial chip and iam directly connecting 3.3v except 5 v. Weird behaviour like now sometime it start flashing and then stop at 44% and then fatal error no packet header. Then after that again co...

I do have issues in ESP32 schematics as U4 is just serial ic not linked with ESP32 module.

Here is the PCB prorotype board with ESP32 WROOM 32D module and will be use with Raspberey PI after this. But somehow , i think we have received either corrupted flash or module. We have tried every possible way to correct it but noway to found the failure. Is there any other way to find the root ca...

Thanks for reply. I forgot to mention one part of schematic where iam using ams1117 to convwet from 5v to 3.3v. So thats why connected to 5v pin of USB. Current and voltage is perfectly matched as per esp32 requirement, but i didnot chk the uart0 logs. How to chk those logs ? But i chkd the board wi...

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