Skip bootloader updates if rpi-eeprom package is too old

Skip the bootloader updates without stopping rpi-update of the firmware

See: #28

rpi-update

@@ -292,6 +292,7 @@ function download_bootloader_images {
 
 function download_bootloader {
 	if [[ ${SKIP_BOOTLOADER} -eq 0 ]]; then
+
 		echo "Downloading bootloader tools"
 		download_bootloader_tools
 
@@ -773,6 +774,15 @@ if [[ "${FW_REV}" == "" ]]; then
 	exit 1
 fi
 
+if [ ! -d "/lib/firmware/raspberrypi/bootloader-2711/latest" ]; then
+	if [[ "${SKIP_BOOTLOADER}" != 1 ]]; then
+		# The chip specific firmware directory structure is required for rpi-eeprom updates
+		# RPi OS Bookworm or newer required.
+		SKIP_BOOTLOADER=1
+		echo "rpi-eeprom firmware package appears to be too old. Skipping bootloader updates"
+	fi
+fi
+
 if [[ ! -f "${FW_REVFILE}" ]]; then
 	LOCAL_HASH=0
 	echo " *** We're running for the first time"