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Install the Microchip SAM-BA utility on a Linux PC following this article: Write on NANDFLASH end EMMC memories with SAM-BA 3.7
When SAM-BA in installed launch this command to read the register 0Xffffee40
to check the ROM code
sudo ./sam-ba -p serial:ttyACM0:115200 -d sama5d3 -m read32:0Xffffee40
Opening serial port 'ttyACM0'
Connection opened.
read32(0xffffee40)=0x8a5c07c3
Connection closed.
The Old ROM code is 0x8A5C07C2
The New ROM code is 0x8A5C07C3