Extract the Firmware file from the ZIP (the firmware file is a .img file).
Copy & paste the extracted file to the root directory on the SD card (please use SD card with FAT16 or FAT32 file system)
Insert the SD card into the PicoPix and then power it on.
Go to Main Menu/Setting/Maintenance/Firmware Update, follow the instruction to start update process.
Wait for the progress bar until it reaches 100%. Then follow the instructions.
Important: Do not unplug the power adapter during the firmware update.