I'm using a Raspberry Pi to slash the firmware. I find this simplier that using a USB TTY device plus I also have a number of Raspberry Pi's lying around.

Prerquisite

Install PIP

apt install python3-pip
sudo pip3 install esptool

Change Config Files

Serial device --> /dev/ttyAMA0

cmdline.txt

 vi /boot/cmdline.txt

delete

 "console=serial0,115200"

config.txt

 vi /boot/config.txt

add

 "enable_uart=1"

Flashing

Display Existing

 esptool.py --port /dev/serial0 flash_id

Backup

 esptool.py --port /dev/serial0 read_flash 0x00000 0x400000 sonoff-image4M-stock.bin

Erase

 esptool.py --port /dev/serial0 erase_flash

Flash

Here I'm downloading the sonoff.bin file from thehackbox but writing the file as sonoff-6.7.1.bin. At time of download the version has probably changed, so write the file as per the correct version number so you know which version of the file you have.

wget http://thehackbox.org/tasmota/release/sonoff.bin -O /home/pi/Downloads/sonoff-6.7.1.bin

esptool.py --port /dev/serial0 write_flash -fm dout 0x0 /home/pi/Downloads/tosmato-sonoff-6.7.1.bin

Configure

mincom

Minicom is a terminal app to allow connection to the Sonoff over serial so we don't need to connect to the device over Wi-Fi for initial configuration.

 minicom -b 115200 -o -D /dev/serial0

 backlog ssid1 myssid; password1 mypassword

settings

change the settings as you require.

backlog ipaddress1 10.13.13.238; ipaddress2 10.13.13.254; ipaddress3 255.255.255.0; ipaddress4 8.8.8.8
backlog ntpserver au.pool.ntp.org; timezone +10; Latitude -27.475646; Longitude 153.030499
backlog PowerOnState 1; teleperiod 20; PowerRetain 1
backlog MqttUser username; MqttPassword passw0rd; Topic laundry; FriendlyName laundry; MqttHost 10.13.13.253
module 43

Field	Description
ipaddress1	IP address
ipaddress2	gateway
ipaddress3	IP mask
ipaddress4	DNS

Modules

Number	Descrption
0	Generic
1	Basic
4	TH
5	Dual
43	Pow R2

....and many more.

Flash Tasmota to Sonoff using Raspberry Pi

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