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* Add 2711 bootcode and FW binaries with the 4 suffix. * Use the device descriptor to select the correct bootcode and hack it so that bootcode.bin translates to bootcode4.bin on a Pi4 allowing the files to remain in the same directory. * Add the latest best for recovery.bin and pieeprom.bin for CM4 * Update the installer. Move the second stage preparation until after the device descriptor has been retrieved because BCM2711 needs a different bootcode.bin. If the '-d' argument specified then check for bootcode.bin in the specified directory and don't fail over to the embedded fmem files. Remove the default 'msd' directory and the references to /usr/share because the behaviour conflicts with the original change to use the fmem files.
