This exploit is metioned in my Blackhat Europe 2019 talk with David Oswald (Breaking Bootloaders on the Cheap): https://i.blackhat.com/eu-19/Thursday/eu-19-Temeiza-Breaking-Bootloaders-On-The-Cheap-2.pdf
This exploit breaks the CRP-1 of the LPC1343 and also it can break CRP-1 on some other LPC devices (it may need modifications in order to work on the other vulnerable LPC devices). ONLY FOR RESEARCH PURPOSES
-Encode the exploit using a UU-encoding tool
-Invoke the UART bootloader
-Call the "Write to RAM" command via entering "W 268443476 172"
-Send the econded exploit to the device
For more details please refer to the Blackhat talk.