Changed README.md to included latest firmware

README.md

@@ -10,17 +10,11 @@ For reference, a temperature sensor and pressure sensor is used
 
 ## Installation
 ### ESP32 Firmware
-Download the latest firmware for the ![ESP32 AZ Delivery Devkit v4](https://git.uibk.ac.at/csba5141/co2-sensors/-/jobs/artifacts/main/raw/.pio/build/az-delivery-devkit-v4/firmware.bin?job=ESP-Firmware).
-Flash the device using PlattformIO with
-```
-pio run -t nobuild -t upload --upload-port PORT_NAME
-```
-and exchange `PORT_NAME` with the device's port. To show all available ports with PlattformIO use
-```
-pio device list
-```
+To get the firmware for the ESP32 AZ Delivery Devkit v4, download the ![folder with the firmware inside](https://git.uibk.ac.at/csba5141/co2-sensors/-/archive/main/co2-sensors-main.zip?path=build_firmware).
+This folder contains an ESP flasher, the firmware for forced calibration and for normal operation.
 
-*Alternatively*, flash the ESP32 with a flasher program of your choice.
+To flash the ESP with the main firmware run `upload_main.bat`. For calibration with a reference CO2 value, use `upload_calibration.bat`. Please note that the DataLogger can't send the CO2 reference value.
+This isn't implemented and has to be done with a program capable of communicating via Serial. Furthermore, the ESP won't start unless it has a connection via Serial.
 
 ### Logger program
 The logger program ![executable built for Windows 10, version 22H2](https://git.uibk.ac.at/csba5141/co2-sensors/-/raw/main/dist/DataLogger.exe) can be downloaded *or* build by source as shown below.