FW Release Notes :

1. “Fixed DNS-O-Matic dynamic DNS with “ssl connect error” issue”.
2. “Fixed Sky VDSL Option 61 WAN delay when DHCP lease is renewed” (causes delay/lag every hour).
3. “Users can now generate random CA on OpenVPN server”.
4. “Added new OpenVPN HMAC Authentication for more security support for SHA256, SHA384, SHA512”.

Firmware Link  Bipac 8900AX-2400 2.52.d48