After upgrading to the newest firmware I was eager to try DHCP option customisation feature.  Unfortunately when added option 43 with custom hex it is not passed to the DHCP clients. Same with option number 222, but for example 249 works like expected. 

tcpdump output:

15:37:04.107089 IP (tos 0xc0, ttl 64, id 57267, offset 0, flags [none], proto UDP (17), length 340)
    192.168.0.1.bootps > test.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 312, xid 0x56a10536, secs 1, Flags [none] (0x0000)
      Your-IP test
      Server-IP 192.168.0.1
      Client-Ethernet-Address xx:xx:xx:xx:xx:xx (oui Unknown)
      Vendor-rfc1048 Extensions
        Magic Cookie 0x63825363
        DHCP-Message Option 53, length 1: ACK
        Server-ID Option 54, length 4: 192.168.0.1
        Lease-Time Option 51, length 4: 7200
        RN Option 58, length 4: 3600
        RB Option 59, length 4: 6300
        Subnet-Mask Option 1, length 4: 255.255.255.0
        BR Option 28, length 4: 192.168.0.255
        Default-Gateway Option 3, length 4: 192.168.0.1
        Domain-Name Option 15, length 3: "lan"
        Hostname Option 12, length 7: "test"
        Classless-Static-Route-Microsoft Option 249, length 4: ERROR: length < 5 bytes
        Domain-Name-Server Option 6, length 4: 192.168.0.1
        END Option 255, length 0
    0x0000:  xxxx xxxx xxxx 9ca2 f4e8 8aa3 0800 45c0
    0x0010:  0154 dfb3 0000 4011 1770 c0a8 0001 c0a8
    0x0020:  0064 0043 0044 0140 d970 0201 0600 56a1
    0x0030:  0536 0001 0000 0000 0000 c0a8 0064 c0a8
    0x0040:  0001 0000 0000 xxxx xxxx xxxx 0000 0000
    0x0050:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0060:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0070:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0080:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0090:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00a0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00b0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00c0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00d0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00e0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x00f0:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0100:  0000 0000 0000 0000 0000 0000 0000 0000
    0x0110:  0000 0000 0000 6382 5363 3501 0536 04c0
    0x0120:  a800 0133 0400 001c 203a 0400 000e 103b
    0x0130:  0400 0018 9c01 04ff ffff 001c 04c0 a800
    0x0140:  ff03 04c0 a800 010f 036c 616e 0c07 7069
    0x0150:  6e67 7769 6ef9 04de adbe ef06 04c0 a800
    0x0160:  01ff

UI screenshot:

Anyone had success with this?