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# Hacking RTL9601C1
Hacking V2801F & TWCGPON657 to suite your ISP Fiber
# Setup
Setup your [SFP XPON ONU Stick here](Docs/Setup_Stick.md)
> GPON market is a mess, plus explicit OMCI cause ONU Stick did not work
# Guide, Links, Info
* [Setup SFP XPON ONU Stick here](Docs/Setup_Stick.md)
* [Utility Link, Firmware Update](Docs/Useful_Links.md)
* [TWCGPON657 with V2801F firmware](Docs/TWCGPON657.md)
* [V2801F Auto Reboot](Docs/V2801F.md)
# Issue
GPON market is a mess, plus explicit OMCI cause ONU Stick did not work
## With my issue:
* [V2801F](https://www.amazon.com/Universal-Stick-Address-Supported-Attention/dp/B08C818JSQ)
@ -83,82 +86,3 @@ Based on [ru-board](http://forum.ru-board.com/topic.cgi?forum=8&topic=80480&star
* V2801F cannot use TWCGPON657 firmware
* DFP-34X-2C2 (Realtek) cannot use V2801F firmware
* TWCGPON657 **can use** V2801F firmware
# Utility Link, Firmware Update
[Read here (with images)](Docs/Useful_Links.md)
# 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](Docs/VS_AUTH_KEY.md)
### 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
* Please read [FLASH_GETSET_INFO.md](Docs/FLASH_GETSET_INFO.md) for how to configure, login, etc...
* Advance setting like duplicate ONT Info, read [FLASH_GETSET_DEV.md](Docs/FLASH_GETSET_DEV.md)
* For a manual for the built-in Realtek `diag` utility, see: [RTKPONDiagShellUserGuide](Docs/RTKPONDiagShellUserGuideV001.291982779.pdf)
* Source: https://usermanual.wiki/Pdf/RTKPONDiagShellUserGuideV001.291982779/html
# 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 *
```