Hi,
I've read some old (2017) thread about this topic but I've not found the final answer.
I've just tried to replace my 2TB seagate original disks with two 4TB WD Red Plus drives but my Network Space Max boot with flashing red/blue.
I've tried the restore procedute with LaCie Network Assistant: the restore app find the device, the led is becoming blue but after a while it still flash to red/blue.
Does there is currently a way to update the bootloader to support larger drive and install fvdw-sl ?