WiNG 5.2.1 is officially released and available on the support web site.  Please READ THE RELEASE NOTES for details on this firmware release.

Download can be requested via the below included links:

RFS7000 Series 5.2.1.0 Firmware
RFS6000 Series 5.2.1.0 Firmware
RFS4010 Series 5.2.1.0 Firmware
RFS4011 Series 5.2.1.0 Firmware
NX9X00 Series 5.2.1.0 Firmware
AP6511 Series 5.2.1.0 Firmware
AP7131 Series 5.2.1.0 Firmware
AP7161 Series 5.2.1.0 Firmware
AP6532 Series 5.2.1.0 Firmware
AP6521 Series 5.2.1.0 Firmware