Step by step installation copier firmware toshiba e-Studio 2040C, 2540C, 2040cSE, 2540cSE, 3540c, 3540cSE. The firmware must be installed when replacing the hdd or when its data is corrupted, the copier does not boot, displays errors F520, F101 4, F101 5, F101 6, F101 7, F101 8, F101 9, etc.