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program the LPC 4357 controller on field  using USB boot mode and using the utility DFUSEC_V1_11???

Question asked by Monarch BAXI on Oct 7, 2016

We want to program our controller LPC4357 using USB boot mode
We were able to program the controller using USB boot mode and using the utility DFUSEC_V1_11 available on NXP website
We have used the following hardware configuration
Pin P2_7 ---> LOW
Pin P2_9 ---> LOW
Pin P1_1---> LOW
Pin P2_8 --->HIGH
Pin P1_2 ---> HIGH


However once the firmware is downloaded in the controller we were not able to reprogram it using the USB IAP mode.
To reprogram the device we had to again configure pin P2_7 --> LOW, but we cannot pull this pin to GND if we require to reprogram the device on field without opening the instrument .


It is Ok for us to Pull the pin P2_7to GND when the device is programmed for the first time, but we need to avoid this when we need to re-program the device on field


As such can u pl let us know the procedure / set of commands that can be used to re-program the device without configuring pin P2_7 (LOW)