The firmware is copied into the drives, so if you change the drives, the firmware is lost.
The operating system partitions are EXT3 and the data partition is XFT (yes Linux).
Most of the drives shipped with LS are green Samsung or WD.
If you change the drives you have an E6 and you have to perform a TFTP boot. Version 1.33.exe works fine.
Firmware is the same for
Model LS-XHL, LS-CHL, LS-WXL, LS-WSXL, LS-VL, LS-WVL, LS-QVL, LS-XL Series
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In other words, start from the very beginning of my instructions.