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  1. You should at least solder the T3.1 to header....

    You should at least solder the T3.1 to header. Otherwise, there are no good contacts and lot of electric noise.
  2. how did you connect sdcard to T3.1? can you...

    how did you connect sdcard to T3.1?
    can you provide picture of wiring?
    what code did you use?
    schematics of ADC buffer?
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