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This video shows how to install USB and Bluetooth in the standard Blaupunkt RD4-02 radio from a Citroen car. Supplement: Since this model of radio does not have a pre-amplifier at the AUX input, we had to leave the amplifier on the board of the built-in module. Otherwise, without it, the overall volume of the radio is reduced by half, and with the amplifier everything works fine. Link to the module used: https://aliexpress.ru/item/4000400812...