Serial LTE modem code don't start

Hi everyone !

I have a strange issue, when I flash : nrf9160dk_at_client_2024-07-12_5cb85570.hex on our board the code is running normally. But when I flash nrf9160dk_serial_lte_modem_2024-07-12_5cb85570.hex the code don't start on some board. The nrf chip never send Ready on the bus even when the RTS and CTS are down.

Do you know the difference between the 2 code at the startup ?

To flash the firmware I'm using programmer V4.4.0 I also flash mfw_nrf9160_1.3.6.zip.

Best regards,

Alban

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