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.

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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VladStanEditorial StaffLD Taylorletroll Recent comment authors
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Vlad
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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
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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.

Stan
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Stan

I have same issue with sonoff POW after succesfull backup/restore it is dead no light. The flash size is correct 4MB Source POW: C:\esptool-2.6>esptool.py –port COM3 flash_id esptool.py v2.6 Serial port COM3 Connecting…. Detecting chip type… ESP8266 Chip is ESP8266EX Features: WiFi MAC: 5c:cf:7f:92:2d:34 Uploading stub… Running stub… Stub running… Manufacturer: e0 Device: 4016 Detected flash size: 4MB Hard resetting via RTS pin… C:\esptool-2.6>esptool.py –port COM3 read_flash 0x00000 0x400000 image4M.bin esptool.py v2.6 Serial port COM3 Connecting…. Detecting chip type… ESP8266 Chip is ESP8266EX Features: WiFi MAC: 5c:cf:7f:92:2d:34 Uploading stub… Running stub… Stub running… 4194304 (100 %) 4194304 (100 %) Read… Read more »

Smax
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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
Guest
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
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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

letroll
Guest
letroll

push the button when plugging ftdi usb cable and release it after 2 seconds

Smax
Guest
Smax

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

Smax
Guest
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
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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
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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