Telink Flasher

Be sure to select the device with the requested MAC address:

Tas Request mac: callback:

Instructions to get a key for original MI firmware:

1/ Click connect, and select the device with the matching MAC address
Notes:
Currently we can't read the MAC address here to confirm you selected the right device.
If you have only one device, Chrome may not show you the MAC address.
You may need to wait for a minute or two for all devices to appear.
Every time you get a key for a device, the key changes, so you would need new startup commands in Tasmota

2/ Wait for 'Do Activation' to appear, then click it.
Please wait

3/ Wait for a link to appear here:
Please wait Click to directly apply this key to Tasmota via a callback url.
Cmnd for boot would be:

4/ Note the presented Tasmota command.
This should be added to a rule or other boot mechanism to add the key at every Tasmota restart
You can combine setting of keys using 'MI32Keys mac=key mac2=key2 mac3=key3'
You can list all keys present in Tasmota to log/MQTT using the cmnd 'MI32Keys' on it's own

5/ Close this tab

Be sure to select the device with the requested MAC address:

Instructions to install custom firmware:

2/ Click on Choose file, and select your custom firmware file, e.g. "ATC_Thermometer.bin"
Select Firmware:

3/ Click 'Start Flashing'

Please wait

4/ Configure the custom firmware
Reconnect?
Use the features below to configure the new firmware.

Note: this may be out of date - you are better to visit the links above

Video Manual Custom firmware repo

Hide unknown
BLE device name prefix filter(s)

Please select a .bin file you want to flash to a Telink BLE device.

Select Firmware:

Status: waiting for you to connect a device

Temp/Humi: waiting for data, this will not change on devices with custom firmware, only on stock firmware

#enable-experimental-web-platform-features may be needed to read MAC

Device known id:

Mi Token:

Mi Bind Key:

When doing an activation here the device is needed to be activated in the Mi app again when wanted to use there.

Send settings to custom firmware:

Smiley:

Advertising Type:

Sensor display:

Show battery in LCD:

Advertising interval:

Sensor offset:
To set a precise offset use the text input field with FA+offset for Temp and FB+offset for Humiditiy convert an int8 to hex.

Sensor instant Advertising:
To set other values use the text input with FC+temp alarm or FD+humi alarm with uint8_t values. This can be used to get instant advertising if the sensor data changes to fast. Temp divided by 10