Hi,
Booting from SD card is not possible with this MCU. You can check boot modes in table 169 and 170 of the User Manual.
Additionally, you can use Flash Magic to communicate with LPC55S69 in ISP mode. Please check the link below for more details.
https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/lpc%40tkb/201/3/Flash%20Magic%20programm...
Have a great day,
Felipe
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