Installation / Setup Tips

The firmware differences between M4600H FAB3 SIM & FAB5 SIM

For older version of firmware equal and below 0.93 cannot upgrade to over later than 0.93(SIM revision displays before & equal D on SIM mainboard means FAB3), otherwise the ROM chip will be damanged and could not recover back. On the other hand, for SIM board revision displays equal & later than E means FAB5 can tolerate the older firmware downward. Please take these tips as important notes before you upgrade the firmware!