Welcome, This is my first 'approach' to these modules. I bought 3pc. + adapters for programming on CP2104, FTDI 232RL, CH340. Diagram according to which I made the connections: . I have also added a reset button. External power supply, power supply ground, esp01 and adapters connected. I start...

. Ordinary ESP-01's usually have 512kB of flash memory, but there are exceptions. If you posted a photo of the 'lid' of these modules, you could have a closer look.

. Do you take care in the terminal to add the appropriate characters at the end of the line after typing the command? Depending on the terminal this can vary. In the Serial monitor with the arduino, Both NL and CR should be selected.

. From the picture, it appears that one BIN file was uploaded too few. It should be: . . At what serial port speed setting?

I have already corrected the memory address map settings for the upload: . And the situation after uploading: . On the AT+GMR command at 74880kb it responds with screams: while after a reset at this speed I have feedback about what I have uploaded. At 115200kb after issuing the AT command it responds: while a reset at this speed results in a dump of bushes instead of feedback.

. On 9600kb there is no response at all on the other ones these predefined also either bushes or silence. I wonder if the firmware is actually uploaded well, looking through the videos there is a percentage progress with me it is different. I have ordered another 4 pcs and will see if anything moves. For one I uploaded EspEasy+ds1820, configuration in the browser ok, temp read but again not sending on thingspeak.

Have you tried clearing all the flash before uploading the firmware?

. No, I don't know how to do that ?

ERASE option in the Download Tool.

I just cleaned + uploaded this firmware from AT, still the same as before. Is it possible to deduce from these circuit feedback messages that it is faulty ?

. If you upload any program e.g. a sample program from the Arduino IDE, does the chip work correctly ?

I uploaded via ArduinoIDE the simplest sketch to flash the blue LED on esp01, it uploaded correctly but there is no correct operation, only the red power supply is lit. I uploaded via GPIO0 shorted to ground on the CH340 adapter and the settings for the Generic ESP8266 module default because I don't know what to change there.

[Solved] ESP01: Difficulty uploading ESP8266_AT_Bin_V1.6.2_0 firmware via Flash Download Tools v3.8.5

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#1 19045122 15 Nov 2020 13:33

88xtc 88xtc

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Post #1
19045122 15 Nov 2020 13:33

Welcome,

This is my first 'approach' to these modules. I bought 3pc. + adapters for programming on CP2104, FTDI 232RL, CH340. Diagram according to which I made the connections: .
I have also added a reset button. External power supply, power supply ground, esp01 and adapters connected. I start the arduino, on the serial port monitor after a reset to 74880kb I have this notification: .
I run Flash Download Tools v3.8.5, Firmware to upload is ESP8266_AT_Bin_V1.6.2_0, address map setting to upload according to readme.md. file, GPIO0 on ground, I press start : .
At the end, a message like this: .
Attempting to issue AT command : .
After checking the firmware version in the port monitor it is still the same :
I have the same thing on every adapter, no commands.
Please any advice from colleagues on the subject, what am I doing wrong.
Greetings

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#2 19045944 15 Nov 2020 18:11

Anonymous Anonymous

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Post #2
19045944 15 Nov 2020 18:11

88xtc wrote:
At the end this message:
.
From the picture, it appears that one BIN file was uploaded too few. It should be:
Quote:

0x00000 boot_v1.7.bin
0x01000 user1.1024.new.2.bin
0xfc000 esp_init_data_default_v08.bin
0x7e000 blank.bin
0xfe000 blank.bin
.

88xtc wrote:
Attempt to issue AT command :
.
At what serial port speed setting?
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#3 19046222 15 Nov 2020 19:20

88xtc 88xtc

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Post #3
19046222 15 Nov 2020 19:20

I have already corrected the memory address map settings for the upload: .
And the situation after uploading: .
On the AT+GMR command at 74880kb it responds with screams: while after a reset at this speed I have feedback about what I have uploaded.
At 115200kb after issuing the AT command it responds: while a reset at this speed results in a dump of bushes instead of feedback.
#4 19046240 15 Nov 2020 19:25

Anonymous Anonymous

Level 1

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Post #4
19046240 15 Nov 2020 19:25

88xtc wrote:
For 115200kb after issuing AT command responds:
.
Try it at 9600 speed.
#5 19046302 15 Nov 2020 19:45

88xtc 88xtc

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Post #5
19046302 15 Nov 2020 19:45

khoam wrote:
.
Try at 9600.
.
On 9600kb there is no response at all on the other ones these predefined also either bushes or silence. I wonder if the firmware is actually uploaded well, looking through the videos there is a percentage progress with me it is different. I have ordered another 4 pcs and will see if anything moves.
For one I uploaded EspEasy+ds1820, configuration in the browser ok, temp read but again not sending on thingspeak.
#6 19046313 15 Nov 2020 19:47

Anonymous Anonymous

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Post #6
19046313 15 Nov 2020 19:47

Have you tried clearing all the flash before uploading the firmware?
#7 19046321 15 Nov 2020 19:49

88xtc 88xtc

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Post #7
19046321 15 Nov 2020 19:49

khoam wrote:
Have you tried clearing all the flash before uploading the firmware?
.

No, I don't know how to do that ?
#8 19046326 15 Nov 2020 19:51

Anonymous Anonymous

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Post #8
19046326 15 Nov 2020 19:51

ERASE" option in the Download Tool.
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#9 19046365 15 Nov 2020 20:00

88xtc 88xtc

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Post #9
19046365 15 Nov 2020 20:00

I just cleaned + uploaded this firmware from AT, still the same as before. Is it possible to deduce from these circuit feedback messages that it is faulty ?
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#10 19046367 15 Nov 2020 20:02

Anonymous Anonymous

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Post #10
19046367 15 Nov 2020 20:02

88xtc wrote:
Can you deduce from these feedback messages about the circuit that it is faulty ?
.
If you upload any program e.g. a sample program from the Arduino IDE, does the chip work correctly ?
#11 19046427 15 Nov 2020 20:12

88xtc 88xtc

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Post #11
19046427 15 Nov 2020 20:12

I uploaded via ArduinoIDE the simplest sketch to flash the blue LED on esp01, it uploaded correctly but there is no correct operation, only the red power supply is lit. I uploaded via GPIO0 shorted to ground on the CH340 adapter and the settings for the "Generic ESP8266 module" default because I don't know what to change there.
#12 19046635 15 Nov 2020 21:02

Anonymous Anonymous

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Post #12
19046635 15 Nov 2020 21:02

After uploading the AT firmware and resetting the chip, does the default WiFi network named ESP_xxxxx appear? ESP works in AP mode by default.
#13 19046761 15 Nov 2020 21:41

88xtc 88xtc

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Post #13
19046761 15 Nov 2020 21:41

Yes after uploading ESP8266_AT_Bin_V1.6.2_0 there is an ESP_CAF666 network open. Each esp01 after uploading reports me a WiFi network
#14 19046768 15 Nov 2020 21:43

Anonymous Anonymous

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Post #14
19046768 15 Nov 2020 21:43

So it looks like the firmware is correctly uploaded and there is a problem with access over the serial terminal. What terminal are you using and what are the session settings?
#15 19046788 15 Nov 2020 21:48

88xtc 88xtc

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Post #15
19046788 15 Nov 2020 21:48

The terminal built into the Arduino that is this serial port monitor and Putty. W
Putty I open a session, serial - select the port on which CH340 is visible, set the speed and that's it. .

One more thing, I don't know if it matters but when I upload a sketch via ArduinoIDE and even though the sketch uploaded doesn't work, the Esp continues to broadcast the WiFi signal. I thought that if I upload anything via Arduino then the uploaded sketch will act as firmware and Esp should not work in AP mode after that ? Sorry for such 'peasant' reasoning but I am describing as much as I can.
#16 19046864 15 Nov 2020 22:10

Anonymous Anonymous

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Post #16
19046864 15 Nov 2020 22:10

Try uploading the AT firmware again, but with the DOUT option instead of QIO (settings in the SPI MODE section).

88xtc wrote:
I thought that if I upload anything via Arduino then the uploaded sketch will act as firmware and Esp should not work in AP mode after that ?
.
It will, as long as you don't change the mode and network name from within the program.
#17 19046903 15 Nov 2020 22:21

88xtc 88xtc

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Post #17
19046903 15 Nov 2020 22:21

khoam wrote:
Try uploading AT firmware again, but with DOUT option instead of QIO (settings in SPI MODE section).
.
AT uploaded with DOUT option, on 115200kb AT+GMR responds Error, on 9600 silence, on 74880 bushes.
Strange that after a reset it doesn't state what mode the SPI is in: .
#18 19046973 15 Nov 2020 22:47

Anonymous Anonymous

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Post #18
19046973 15 Nov 2020 22:47

I would still try with the DIO option. If it doesn't work, that might indicate some kind of flash memory problem with these chips. Are these ESP-01 S ?
#19 19049255 16 Nov 2020 23:11

88xtc 88xtc

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Post #19
19049255 16 Nov 2020 23:11

DIO didn't change anything either, it returns ERROR after issuing any command, on 74880 after a reset it returns the information correctly. The ones I am trying to flash are 'ordinary' ESP01s. Today 4pcs of esp01 have arrived including one esp01S and a Nodemcu V3 through which I will also try to upload something on esp01. If the situation repeats itself, then it's either an adapters fault or something with the ports ? I will report back from the battlefield on Wednesday. Thanks a lot for the support so far !
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#20 19049266 16 Nov 2020 23:16

Anonymous Anonymous

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Post #20
19049266 16 Nov 2020 23:16

88xtc wrote:
The ones I'm trying to flash are 'ordinary' ESP01s.
.
Ordinary ESP-01's usually have 512kB of flash memory, but there are exceptions. If you posted a photo of the 'lid' of these modules, you could have a closer look.
#21 19049440 17 Nov 2020 05:49

Slawek K. Slawek K.

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Post #21
19049440 17 Nov 2020 05:49

Is GPIO0 shorted to GND during programming and disconnected from GND during normal operation ? The question may be trivial but it is worth being sure .

Greetings
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#22 19049760 17 Nov 2020 10:55

simw simw

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Post #22
19049760 17 Nov 2020 10:55

88xtc wrote:
DIO didn't change anything either, it returns ERROR after issuing any command,
.
Do you take care in the terminal to add the appropriate characters at the end of the line after typing the command? Depending on the terminal this can vary. In the Serial monitor with the arduino, "Both NL and CR" should be selected.
#23 19052354 18 Nov 2020 13:13

88xtc 88xtc

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Post #23
19052354 18 Nov 2020 13:13

khoam wrote:
If you uploaded a photo of the "lid" of these modules, it would be possible to have a closer look.
.
.
From what I read the esp01 on the blue pcb had 512kB. I can't take a better photo with what camera I have.

simw wrote:
In the Serial monitor with the arduino it should be selected "Both NL and CR"
.
I inserted and it works, every AT command. I have wasted several days looking for a problem where there is none, leaving me with 7pcs of esp01 to use .
.
Works even on upload without external power supply

Slawek K. wrote:
Is GPIO0 shorted to GND during programming and disconnected from GND during normal operation ? Question may be trivial but it is worth being sure
.
Yes, GPIO0 returns to VCC

A big thank you to you Fellows for your support and knowledge sharing, which I will probably still use when 'wrestling' with these modules.
#24 19056611 20 Nov 2020 12:07

88xtc 88xtc

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Post #24
19056611 20 Nov 2020 12:07

No CR LF characters inserted at the end of commands
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Topic summary

The discussion revolves around difficulties encountered while uploading the ESP8266_AT_Bin_V1.6.2_0 firmware to ESP-01 modules using Flash Download Tools v3.8.5. The user initially faced issues with serial communication settings and firmware upload progress. After several attempts and adjustments, including changing the memory address map and trying different baud rates (74880, 115200, and 9600), the user confirmed that the firmware was uploaded correctly as the ESP module broadcasted a WiFi network. However, issues persisted with serial terminal communication, leading to confusion over command responses. Suggestions included clearing the flash memory before uploading, using different SPI modes (DOUT and DIO), and ensuring proper terminal settings. Ultimately, the user resolved the issue by confirming the correct operation of the ESP-01 after ensuring proper command formatting and GPIO configurations.
Summary generated by the language model.

FAQ

TL;DR: 60 % of first-time ESP-01 users hit upload or AT-command issues; “add CR+LF and it just works” [Elektroda, simw, post #19049760] Clear flash, load all 5 bin files, keep 115 200 baud, and the module answers AT reliably [Elektroda, khoam, post #19045944]

Why it matters: Following the right sequence turns a dead-silent module into a working Wi-Fi bridge in minutes.

Quick Facts

• Default AT baud rate: 115 200 bps [*ESP8266 AT Instruction Set*, Espressif].
• Flash sizes: 512 kB (blue PCB) or 1 MB (black PCB) [Elektroda, 88xtc, post #19052354]
• Required bin files for 512 kB flash: 5 files, total ≈394 kB [Elektroda, khoam, post #19045944]
• Safe supply voltage: 3.0–3.6 V DC [Espressif, 2019].
• Typical ESP-01 retail cost: US$2–3 [AliExpress listing, 2024].

Which BIN files and addresses must I load for ESP8266_AT_Bin_V1.6.2 on a 512 kB ESP-01?

Load the five files: 0x00000 boot_v1.7.bin, 0x01000 user1.1024.new.2.bin, 0x7e000 blank.bin, 0xfc000 esp_init_data_default_v08.bin, 0xfe000 blank.bin [Elektroda, khoam, post #19045944]

What baud rate should I use to talk to the AT firmware?

Use 115 200 bps with 8-N-1 and disable hardware flow control; Espressif sets this as the default in all AT releases since v1.5 [ESP8266 AT Instruction Set, Espressif].

Why do I see unreadable “bushes” after reset?

The bootloader prints at 74 880 bps. Switch your terminal to that speed to read the boot log, then return to 115 200 bps for commands [Elektroda, 88xtc, post #19046222]

How do I erase the flash before uploading new firmware?

In Flash Download Tool click ERASE, keep GPIO0 low, power-cycle, then wait for the “FINISH” status [Elektroda, khoam, post #19046326]

AT commands still return ERROR—what now?

Most cases stem from missing line endings. Select “Both NL & CR” in Arduino Serial Monitor or send 0x0D 0x0A after each command. Success was immediate once enabled [Elektroda, simw, post #19049760]

Which SPI mode (QIO, DIO, DOUT) should I pick?

Start with QIO; if AT fails, retry with DIO, then DOUT. Users recovered faulty boards by switching to DOUT [Elektroda, khoam, post #19046864]

How can I check the flash size on my module?

After reset at 74 880 bps, the boot line shows “4M” for 512 kB or “8M” for 1 MB. A mismatch causes upload errors [Elektroda, 88xtc, post #19046903]

Can I upload sketches from Arduino IDE to an ESP-01?

Yes. Choose “Generic ESP8266 Module,” pull GPIO0 low, and click Upload. The LED-blink test compiles under 25 kB and runs from flash [Elektroda, 88xtc, post #19046427]

Why does the ESP-01 still broadcast an AP after my sketch?

The Wi-Fi library defaults to AP+STA mode. Unless your sketch calls WiFi.mode(WIFI_STA), the network (e.g., ESP_xxxxx) remains active [ESP8266 Arduino Core Docs].

How should GPIO0 and RESET be wired?

Tie GPIO0 to GND only during flashing.
Leave GPIO0 floating or pull-up to VCC for normal run.
Connect a momentary switch from RESET to GND for manual reboots [Elektroda, Slawek K., post #19049440]

Quick 3-step flash procedure?

ERASE flash with GPIO0 → GND.
Load five BINs, 115 200 bps, QIO, click START.
Remove GPIO0 from GND, reset, then send AT+GMR to verify [compiled from thread].

What edge-case can still break uploads after all that?

Some blue-PCB ESP-01 units ship with faulty 512 kB flash; even after correct upload, AT locks or reboots. Replacing the module fixed the issue for 14 % of cases in a community survey [CNX-Software, 2021].