Firmware update, stuck at "Booting... Update FW"

All of your disks have ATA errors:

Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   064   064   000    Old_age   Always       -       26668
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
ATA Error Count: 259 (device log contains only the most recent five errors)
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   064   064   000    Old_age   Always       -       26664
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
ATA Error Count: 76 (device log contains only the most recent five errors)
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   094   094   000    Old_age   Always       -       4706
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
ATA Error Count: 158 (device log contains only the most recent five errors)
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   064   064   000    Old_age   Always       -       26281
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
ATA Error Count: 149 (device log contains only the most recent five errors)

Though these counts last increased in February.