Release note for firmware B.4.3r:

Remove some un-functional options from web management, which is under below section:

1. Service Control
2. UPnP
3. IGMP Snooping
4. automatic reboot fix

Firmware B4.4r
This firmware have the MAC filtered feature parameter (0xFFFF) customer asked been set into kernel,
thus if what he found is the cause of packet dropping, this firmware should be able to fix it