Backup & Restore Official Firmware of Sonoff WiFi Smart Switches

Contents:

Controlling Sonoff Smart Switches without internet over Local Area Network is hot topic for Sonoff enthusiasts. After loading any custom firmware to Sonoff, you cannot go back to the official firmware but now you can!!. Just backup your official firmware by following the instructions below and you can restore it later if you want. So Let’s get started..

Hardware Requirements:

Software Requirements:

Step-by-Step Procedure:

Step A:

Download and install Python 2.x or 3.x from https://www.python.org/downloads. Download Esptool from https://github.com/espressif/esptool/releases. Extract the contents of esptool compressed file to C:\. All the contents of esptool should be under  c:\esptool.

Step B:

  • Open Command Prompt (Start > Run > cmd) and navigate to esptool folder.
  • Install the esptool by issuing the command below.
It takes few seconds to upload firmware and output will be shown as follows.

Step C:

Now We are just one step behind to download / upload any firmware to our Sonoff Smart Switch. Connect FTDI to Sonoff Smart Switch (For detailed information about each Sonoff Switch, visit Sonoff Smart Switch LAN Control without Internet) and start Sonoff device in programming mode. Now find the port under Control Panel > System > Device Manager > Ports at which Sonoff device is connected.

Determine the Flash Size:

  • Change COM5 to your own Port.
  • Wait few seconds and it outputs the flash size as shown in picture below Detected flash size: 4MB.

Backup / Download Official Firmware:

1MB Flash:

4MB Flash:

  • Change COM5 to your own Port.
  • Change flash size parameter  0x100000  for 1MB and  0x400000  for 4MB flash.
  • Wait a minute and firmware binary file will be downloaded and saved in to  c:\esptool

It takes few seconds to upload firmware and output will be shown as follows.

Official Sonoff Firmware Binary Files:

Step D:

Erase Flash Memory:

Erase the custom firmware from flash memory before uploading any new firmware.

  • Change COM5 to your own Port.

It takes few seconds to erase firmware and output will be shown as follows.

Upload Official / Third Party Firmware:

Determine the flash size as discussed in Determine the Flash Size section. Copy the official / any third party firmware binary file to  c:\esptool folder if it is not already there and upload it by issuing the command below.

1MB Flash:

4MB Flash:

  • Change COM5 to your own Port.
  • Change flash size parameter  -fs 1MB  for 1MB and  -fs 4MB  for 4MB flash.
  • Change sonoff.bin to the name of your firmware file inside  c:\esptool folder.

It takes few seconds to upload firmware and output will be shown as follows.

Troubleshooting:

  • Choosing Wrong COM Port will cause the following error.

  • If following output is shown, Sonoff is not correctly connected to FTDI, Check wire configuration or terminals.

  • After restoring the official firmware, if led does not blink, It means you have problem with backup image
    • either backup image is corrupt – Check 3.3v power supply during backup
    • Chose wrong flash size during backup – See Determine the Flash Size Section

 

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SonMax
SonMax

Hi Dear ; Bridge 433 Mhz Do you have a firmware?

mcarav
mcarav

Hello, just for confirmation: I just downloaded the original firmware (previously updated to 3.3.0) using your perfectly working procedure, flashed tasmota, restored the original firmware and repaired with ewelink. Everything ok and flawless. I have a hunch……this is the md5 of the firmware of an original sonoff basic R2 3.3.0 52304de643cbf9539ccc9b0fbe8368a6 if anyone has any other device from iteac still working with the original firmware. Can you try to download it and see if it is has the same md5? I see no point in having so many different firmware, maybe the firmware is the same, depending only on chip’s… Read more »

Prince Choudhary
Prince Choudhary

I need sonoff mini original firmware, Any one have backup of that?

qxs
qxs

hi,if u could help me with orig. firmware for sonoff s20 and sonoff SC.
Thk. you

M J
M J

Hi all – great resource!

Will there be an R3 firmware uploaded soon?

Thanks!

Francisco Javier Rojas Osorio
Francisco Javier Rojas Osorio

I did everything correctly and I already copied the fimware of a new device to the device to recover successfully. BUT when I try to use the eWelink application and try to add the device it says in a state of synchronization that a second generation device has been found, an error box pops up in the app saying: Invalid Data. And the operation is canceled

chathuranga
chathuranga

how to change the mac-address in the hex file pls.

Alex
Alex

Hi to all, i’m trying to restore a Sonoff th 16 with the original fw but, even if the entire procedure is correctly completed, i cannot see the blue led blink….
i’m trying different .bin files…my original and yours..
any suggestions?

Leon
Leon

Anyone have a working backup of a SonOff Basic R2?
I need to know where i must put the chipid.
I found the deviceid and apikey locations, but i need to put my chipid back for it to be restored to the “Original” SonOff state.

Serg k
Serg k

I need Official Sonoff Firmware for Sonoff rf BRIDGE

redlyon
redlyon

Does anyone have the original sonoff T1 US 2C firmware?
Thanks

D. Mora
D. Mora

The only problem I saw running this directions is that the ID flashed in the device is the one coming in the .bin file, which belongs to a real device, so it means that once flashed, the device will have a duplicated id, and when registered into eWelink cloud it will dump the real one, or even worst, all the people downloading this file will be deleting the registry of the device from each one.

So, How to generate a unique Device ID to edit with hex in the bin?

carozoynarizota
carozoynarizota

Hi, I was doing some tests with Sonoff Basic and RF. Downloading their FW and then uploading the files to a different device, also to an ESP-07 stand alone module. This way I was able to make a Sonoff Basic or an ESP-07 run as a Sonoff RF on Ewelink. I tried the same with the RF image shared here and it runs OK, but if I upload the TH10/16 images nothing happens. I power the device, put GPIO to GND for a few seconds but the ITEAD Wifi doesn´t appear. Any clue?

Vlad
Vlad

Great write up, thanks!

I have one residual question. Is it possible to write the official firmware, read from a 1M flash onto a 4M flash?

The reason I ask is that I have swapped the flash chips (from 1M with 4M flash) on most of my Sonoff basic’s. I would like to restore the original firmware onto the 4M flash chips.

LD Taylor
LD Taylor

I have two SONOFF basic switches both loaded with custom firmware. Using your backup/restore processes, I backed up factory firmware and restored to these two switches. The backup, erase, then restore worked perfectly. However, when I powered up both restored switches, nothing, no lights. What am I missing here. Does backup/restore only work with the same switch? Thanks for your guidance.

Smax
Smax

For Martin do you need press button to your sonoff pow and connect power for programming and read.
This is error cpu not in programming mode.9

Smax
Smax

Programmatiin working. I change firmware ok . Test espurna and espeasy work. Revert original with new flash not work . Old flash is burned..
I have double backup. One 1mb and one 4mb. Memory flash is 4mbyte this is Pow sonoff.
Tedted ftdi and board ch340

Martin Hardoy
Martin Hardoy

If you keep getting this:
esptool.py v2.3.1
Connecting…….._____….._____….._____….._____….._____….._____….._____….._____….._____….._____

A fatal error occurred: Failed to connect to Espressif device: Timed out waiting for packet header

Try to disconnect the esp from the PC and start Sonoff device in programming mode again

Smax
Smax

??? Dear not have solution? Change spiffs? Or other ? Have all file for upload? Only Boot ?
Pls help

Smax
Smax

I have dump for my original sonoff pow i have dumped 1mb and 4mb . My fflash type original is 25q32. I have burned original switch in the sonoff pow. And have replaced with 4.5V power supply. And have changed many time to original and espurna.Working fine for 60 day. If reprogramming flash a this day not work. Error md5. A this time have replaced flash with qh32bhig brand xmd, recovered by old lolin board. New test with new flash i have uploaded espurna and work fine. Router ap and work fine. If reinstall original sonoff pow firmware not work.… Read more »

Smax
Smax

Hello dear i have bakup but not working? I have replaced new flash , uploaded my backup and not work. I have error boot @1000 or boot @81000
Help for backup?
Oter firmware working fine.

zweistein
zweistein

Hi,
Great article. Thanks for it.
But I have a problem in reading flash:
“A fatal error occured: Corrupt data, expected 0x1000 bytes but received 0xffd bytes”
Do you have any idea about this error?

Thanks