I'm on 116 right now, and I've already tried 109, 112, 115, all with the same result. I've Google'd this for a week and found nothing like this.. although there are some similar cases but the resolutions don't work here. This is what I did with every flash: 1. Do 30/30/30 reset 2. Flash firmware 3. Clean NVRAM (thorough) [well, just to make sure] 4. Boot up. When the router boots up the first time, everything seems to work. And if I reboot without changing any settings, 5GHz interface (eth2) still shows up. I tried just to change the AP name for both interfaces and reboot, it still works. However, after I've set up the router and reboot, 5GHz is gone. These are the settings I've tampered with: 1. DHCP range (from 192.168.1.10 to 100). My connection is DHCP which obtains IP from another router. 2. Changed both wireless interfaces' name, encryption. Channels set to Auto, both using 40MHz bandwidth, upper control sideband. 3. Changed router Identification. 4. Static DHCP entries for 8 machines. 5. Checked "Mute dhcpv4/v6/RA logging". Included a dnsmasq config of mine via conf-file option. 6. USB stick plugged in, mounted /dev/sda1 to /opt, /dev/sda2 to swap 7. OpenVPN Client 1 & 2. One is TUN via TCP, another is TAP via UDP. 8. PPTP Client 9. Administrative options, like SSH keys, TomatoAnon, Monitoring and Logging, Scheduler and Scripts. The 5GHz interface disappears right after I've completed above settings and reboot. Before reboot the 5GHz still works fine. And below is the dmesg from the router: Code: Linux version 188.8.131.52 (root@tomato) (gcc version 4.2.4) #75 Sun Jan 19 19:57:00 CET 2014 CPU revision is: 00019749 wombo_reset set to gpio 23 Determined physical RAM map: memory: 04000000 @ 00000000 (usable) Entering add_active_range(0, 0, 16384) 0 entries of 256 used Zone PFN ranges: Normal 0 -> 16384 HighMem 16384 -> 16384 early_node_map active PFN ranges 0: 0 -> 16384 On node 0 totalpages: 16384 Normal zone: 0 pages used for memmap Normal zone: 0 pages reserved Normal zone: 16384 pages, LIFO batch:3 HighMem zone: 0 pages used for memmap Built 1 zonelists. Total pages: 16384 Kernel command line: root=/dev/mtdblock2 noinitrd console=ttyS0,115200 Primary instruction cache 32kB, physically tagged, 4-way, linesize 32 bytes. Primary data cache 32kB, 4-way, linesize 32 bytes. Synthesized TLB refill handler (20 instructions). Synthesized TLB load handler fastpath (32 instructions). Synthesized TLB store handler fastpath (32 instructions). Synthesized TLB modify handler fastpath (31 instructions). PID hash table entries: 512 (order: 9, 2048 bytes) CPU: BCM5357 rev 1 pkg 10 at 500 MHz Using 250.000 MHz high precision timer. console [ttyS0] enabled Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) Inode-cache hash table entries: 4096 (order: 2, 16384 bytes) Memory: 61048k/65536k available (33k kernel code, 4424k reserved, 2949k data, 128k init, 0k highmem) Calibrating delay loop... 249.85 BogoMIPS (lpj=1249280) Mount-cache hash table entries: 512 NET: Registered protocol family 16 usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb PCI: no core PCI: no core PCI: Fixing up bus 0 NET: Registered protocol family 2 Time: MIPS clocksource has been installed. IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP established hash table entries: 2048 (order: 2, 16384 bytes) TCP bind hash table entries: 2048 (order: 1, 8192 bytes) TCP: Hash tables configured (established 2048 bind 2048) TCP reno registered squashfs: version 3.0 (2006/03/15) Phillip Lougher io scheduler noop registered (default) HDLC line discipline: version $Revision: 4.8 $, maxframe=4096 N_HDLC line discipline registered. Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled serial8250: ttyS0 at MMIO 0xb8000300 (irq = 8) is a 16550A PPP generic driver version 2.4.2 MPPE/MPPC encryption/compression module registered NET: Registered protocol family 24 PPPoL2TP kernel driver, V0.18.3 PPTP driver version 0.8.5 pflash: found no supported devices Found an ST compatible serial flash with 256 64KB blocks; total size 16MB Creating 5 MTD partitions on "sflash": 0x00000000-0x00040000 : "pmon" 0x00040000-0x00ff0000 : "linux" 0x0013a000-0x00a50000 : "rootfs" 0x00a50000-0x00ff0000 : "jffs2" 0x00ff0000-0x01000000 : "nvram" _nvram_init: allocat header: 2151284736, size= 61440 usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver u32 classifier OLD policer on Netfilter messages via NETLINK v0.30. nf_conntrack version 0.5.0 (512 buckets, 4096 max) ip_tables: (C) 2000-2006 Netfilter Core Team ipt_account 0.1.21 : Piotr Gasidlo <email@example.com>, http://www.barbara.eu.org/~quaker/ipt_account/ net/ipv4/netfilter/tomato_ct.c [Jan 19 2014 19:26:35] NET: Registered protocol family 1 NET: Registered protocol family 10 ip6_tables: (C) 2000-2006 Netfilter Core Team NET: Registered protocol family 17 802.1Q VLAN Support v1.8 Ben Greear <firstname.lastname@example.org> All bugs added by David S. Miller <email@example.com> VFS: Mounted root (squashfs filesystem) readonly. Freeing unused kernel memory: 128k freed Warning: unable to open an initial console. emf: module license 'Proprietary' taints kernel. PCI: Setting latency timer of device 0000:00:02.0 to 64 eth0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 184.108.40.20612 wl_module_init: passivemode set to 0x0 PCI: Setting latency timer of device 0000:00:01.0 to 64 eth1: Broadcom BCM4347 802.11 Wireless Controller 220.127.116.1112 Algorithmics/MIPS FPU Emulator v1.5 ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver PCI: Setting latency timer of device 0000:00:04.1 to 64 ehci_hcd 0000:00:04.1: EHCI Host Controller ehci_hcd 0000:00:04.1: new USB bus registered, assigned bus number 1 ehci_hcd 0000:00:04.1: EHCI Fastpath: New EHCI driver starting ehci_hcd 0000:00:04.1: irq 5, io mem 0x18004000 ehci_hcd 0000:00:04.1: USB 0.0 started, EHCI 1.00 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected usb 1-1: new high speed USB device using ehci_hcd and address 2 usb 1-1: configuration #1 chosen from 1 choice usb 1-2: new high speed USB device using ehci_hcd and address 3 usb 1-2: configuration #1 chosen from 1 choice rpc_dbus_state_change: DBUS is down bcm_rpc_tp_attach: dbus_attach failed usbcore: registered new interface driver dbus_usbdev SCSI subsystem initialized Initializing USB Mass Storage driver... scsi0 : SCSI emulation for USB Mass Storage devices usbcore: registered new interface driver usb-storage USB Mass Storage support registered. vlan1: add 33:33:00:00:00:01 mcast address to master interface vlan1: add 01:00:5e:00:00:01 mcast address to master interface vlan1: dev_set_allmulti(master, 1) vlan1: dev_set_promiscuity(master, 1) device eth0 entered promiscuous mode device vlan1 entered promiscuous mode scsi 0:0:0:0: Direct-Access Generic- SD/MMC 1.00 PQ: 0 ANSI: 0 CCS device eth1 entered promiscuous mode br0: port 2(eth1) entering forwarding state br0: port 1(vlan1) entering forwarding state vlan2: Setting MAC address to c0 c1 c0 d9 bf a0. vlan2: add 33:33:00:00:00:01 mcast address to master interface vlan2: add 01:00:5e:00:00:01 mcast address to master interface IMQ starting with 2 devices... IMQ driver loaded successfully. Hooking IMQ after NAT on PREROUTING. Hooking IMQ before NAT on POSTROUTING. sd 0:0:0:0: [sda] 7677952 512-byte hardware sectors (3931 MB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00 sd 0:0:0:0: [sda] Assuming drive cache: write through sd 0:0:0:0: [sda] Assuming drive cache: write through sda: sda1 sda2 sd 0:0:0:0: [sda] Attached SCSI removable disk EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended Adding 123772k swap on /dev/sda2. Priority:-1 extents:1 across:123772k tun: Universal TUN/TAP device driver, 1.6 tun: (C) 1999-2004 Max Krasnyansky <firstname.lastname@example.org> device tap12 entered promiscuous mode There are a few lines that interests me the most: Code: rpc_dbus_state_change: DBUS is down bcm_rpc_tp_attach: dbus_attach failed usbcore: registered new interface driver dbus_usbdev IIRC the 5GHz interface on E3200 depends on some USB interface to work correctly. Is this why it doesn't work? And what could possibly cause this? Thanks guys.