What tools can I use to download images after securely booting of LPC54S018?

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The LPC54S018 disables SWD once Secure Boot is turned on. In other words, after I start the secure boot, if I want to download the new correctly encrypted image, do I have to enter the ISP mode to download?
I only know that the flash magic tool can be used to download images in ISP mode. I read the signature successfully, but failed to use it to download a plain image. The error it returns is as follows. Are there other recommended tools that can be downloaded in ISP mode?

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The most important question is that, after LPC54S018 securely booting with SWD disabled, what tools I can use to download a new correctly encrypted image?  I hope you can recommend a viable tool for me. Thank you.

[Alice_Yang · Accepted solution]

Hello Kunsen,

When secure boot is completed successfully, the SWD will followed the OTP fields (SWD_EN0 and SWD EN1). Below flow chart in UM is correct.

I suggest that you uses a flash programmer to program a correct secure image into external flash.

And please be careful when config OTP, there is an application note, you can have a look:

https://www.nxp.com/docs/en/nxp/application-notes/AN12352.pdf