@dala
Hi,
Sorry for writing in English, I don't speak German.
I found this thread while Googling for PH-803W firmware flashes...
Some background:
I'm in the process of buying a Wifi PH/ORP measurement tool and found PH-803W on AliBaba. I wanted to check a way to not use the Android App, but redirect the data from PH-803W to a MQTT broker and then integrate with my home automation system. I use HomeSeer for home automation.
According to the picture posted by you the PH-803W uses ESP12f chip, which is based on ESP8266 chipset.
Have to tries to use tools like Tasmota or similar to reflash the device?
There are many toolkits that support ESP8266 firmware rewrite. Take a look:
https://en.wikipedia.org/wiki/ESP8266#Espressif_modules
