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  1. anthony1337

    VTO2000A & VTH5221D firmware upgrade

    Hi everyone, i've already posted my question into a wrong thread, therefore i'm opening a new one as per instructions of @riogrande75 I live in a building with 8 apartments and we have the following setup since 2019: VTO2000A - V3.120. 8x VTH5221D - V4.000. My unit died recently so i was...
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