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Hacking RTL9601C1

Hacking V2801F & TWCGPON657 to suite your ISP Fiber

Issue

GPON market is a mess, plus explicit OMCI cause ONU Stick did not work

With my issue:

  • V2801F
    • Support OMCI explicit provision LAN port on 2/3/4...
    • Support OMCI explicit provision override OMCI_FAKE_OK 1
    • Good Firmware, support many ISP (Global)
    • Build not strudy
  • TWCGPON657
    • Not Working OMCI explicit provision LAN port on 2/3/4...
    • Not Working OMCI explicit provision override
    • Bad Firmware, limited ISP support
    • Silm & Tight build

Triple Play Multiple ISP Problem, 4-port ONU Emulation

  • Majority fiber vendor support multiple ISP
  • ISP provide Triple Play service (Internet, VoIP & IPTV)
  • Vendor supply 4-port ONU for each service or ISP

In this table, list of xPON Stick that support 4-port ONU Emulation

Huawei HG8240H LAN Port
xPON Stick 1️⃣ 2️⃣ 3️⃣ 4️⃣
DFP-34G-2C2 (ZTE) ✔️ ❌ ❌ ❌
DFP-34X-2C2 (ZTE) ✔️ ❌ ❌ ❌
TWCGPON657 ✔️ ❌ ❌ ❌
V2801F ✔️ ✔️ ✔️ ✔️

✔️ Port Emulation Support | ❌ No Support

Based on ru-board 4-Port Emulation is limited, not many xPON Stick can understand, only V2801F do support it, because my Internet comes at Huawei HG8240H LAN Port 4

My Goal Is,

Good Firmware (V2801F) + Good Hardware (TWCGPON657) = Ultimate XPON ONU STICK!

Flash

I have been using TWCGPON657 (without fan) for a month and never had an issue, so in this sections, flash V2801F firmware into TWCGPON657 stick and fix auto-reboot issue.

Steps:

  • Downgrade your TWCGPON657 to version B13 or below.
  • Flash with V2801F_V1.9.0-201104.tar and wait.
  • Quickly login and execute echo 3 > /proc/fiber_mode to avoid auto-reboot (invalid VS_AUTH_KEY)
  • Disconnect fiber from module to restore telnet
  • Update VS_AUTH_KEY acording to ELAN_MAC_ADDR and HW_HWVER
  • Reboot (in telnet)
  • Reflash again with V2801F_V1.9.0-201104.tar (must do after fix VS_AUTH_KEY)
  • Enjoy!

Auto Reboot Fix

V2801F

Issue

  • Invalid VS_AUTH_KEY
  • Changing MAC Address ELAN_MAC_ADDR can cause wrong VS_AUTH_KEY value

Fix

  • You need to generate new VS_AUTH_KEY when change ELAN_MAC_ADDR and HW_HWVER
  • Apperently, you have few seconds to access Telnet before rebooting
  • To prevent auto reboot by entering echo 3 > /proc/fiber_mode (XPON Ethernet Mode)

If you can't type fast enough, use this autoit script quick_telnet-login.au3.

Take a look some generated VS_AUTH_KEY here

Note

When echo 3 > /proc/fiber_mode is set, you lose telnet acccess, you need to unplug fiber to get back

TWCGPON657

  • No such problem, VS_AUTH_KEY does not exist.

Usage

WAN Mapping

If still no Internet, try access http://192.168.1.1/multi_wan_generic.asp and LAN map.

Downgrade

If V2801F firmware not supported on TWCGPON657, you can downgrade via this url: http://192.168.1.1/upgrade.asp

Modify

You need a Linux PC/VM, Ubuntu as Operating System

Prerequisite

You need these program installed:

  • tar (extract tar package)
  • squashfs-tools (extract/repack rootfs)
  • qemu-user-static (run MIPS VM)

Extract firmware

  • Extract Firmware package in tar format, we need rootfs file
  • Extract rootfs partition
unsquashfs rootfs

Repack firmware

  • Repack rootfs
mksquashfs squashfs-root rootfs.new -b 131072 -comp lzma
  • Rename rootfs
mv rootfs rootfs.old
mv rootfs.new rootfs
  • Update md5sum
md5sum fwu.sh rootfs uImage fwu_ver > md5.txt
  • tar current folder
tar -cvf ../firmware.tar *