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MSP430FR5043: BSL on MSP430FR5043, which pins ?

Part Number: MSP430FR5043

I like to communicate with the BSL of the MSP430FR5043. In the document slau550ab.pdf, page 34, table 7-11 it says the BSL is on  eUSCI_A3. I find two sets of UCA3TX/RX pin sets; one on PIN2_0 and PIN2_1 and on PIN 4_1 and PIN4_2. Which one is the correct one?

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