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SKR 3 EZ won't connect to Pi5 via UART using Klipper

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My BTT SKR 3 EZ has just arrived.  I want to use UART to connect to the GPIO of my Pi5 and made two cables.. one with crossover for TX and RX on PA9/PA10 and one without.  I flashed the firmware accordingly (processor= STM32H723, Comms=USART1 on PA10/PA9), changed config.txt (removed console=serial0,115200)  and command.txt (added dtoverlay=pi3-miniuart-bt) on the Pi5 and set serial: /dev/ttyAMA10 in printer.cfg of Mainsail, but can't connect to the MCU with either cable. Any ideas why it's failing?

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