Hello Ken Su,
It's seems that it should use spifiv2_iram_dfu_util_any.bin.hdr?
Yes, you should use this algorithm from now own.
I recommend you to take a look to the tool LPCScrypt. LPCScrypt is a command-line based, fast flash, EEPROM, OTP and security programming tool for LPC1800 and LPC4300 series microcontrollers. Please refer the following link to read more about this tool. LPCScrypt v1.8.2|NXP
Hope it helps!
Victor.
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