Hi @Zoltan_Vilmos_Molnar,
I had the same issue. Iotroniq support directed me to this link: Beüzemelés 1. (SPS30) – Mérj velünk. While it’s helpful, it’s not fully up-to-date. For the first sensor, use the SPS30, but instead of the SHT30, you should select the BME280.
Cheers, Tamas