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# Hacking RTL9601C1
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Hacking V2801F & TWCGPON657 to suite your ISP Fiber
# Issue
GPON market is a mess, plus explicit OMCI cause ONU Stick did not work
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## With my issue:
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* [V2801F ](https://www.amazon.com/Universal-Stick-Address-Supported-Attention/dp/B08C818JSQ )
* 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 ](https://item.taobao.com/item.htm?spm=a1z09.2.0.0.c0552e8d7UBYLF&id=597031866488 )
* 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
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## Single Fiber, Multiple ISP Problem
**Fiber Provider can carry Multiple ISP by provision different LAN Port ONU, example:**
|ONU SFP ⬇️ / Huawei HG8240H LAN Port ➡️ | 1️ ️ ️ ️
|------------------------|-------|-------|-------|-------|
|DFP-34G-2C2 |:heavy_check_mark:|:x:|:x:|:x:|
|DFP-34X-2C2 |:heavy_check_mark:|:x:|:x:|:x:|
|TWCGPON657 |:heavy_check_mark:|:x:|:x:|:x:|
|V2801F |:heavy_check_mark:|:heavy_check_mark:|:heavy_check_mark:|:heavy_check_mark:|
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> :heavy_check_mark: = Can Bridge
>
> :x: = Cannot Bridge (No Internet)
* V2801F firmware can automatically bridge everyting!
* If your ISP on LAN 2 ONU, V2801F firmware can bridge it with **no** settings!
* Most GPON ONU Stick like DFP-34X-2C2 cannot bridge *ONU LAN Port 2 - 4 for Other ISP*
## My Goal Is,
Good Firmware (V2801F) + Good Hardware (TWCGPON657) = Ultimate XPON ONU STICK!
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# 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.
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* Quickly login and execute `echo 3 > /proc/fiber_mode` to avoid auto-reboot (invalid `VS_AUTH_KEY` )
* Disconnect fiber from module to restore telnet
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* Update `VS_AUTH_KEY` acording to `ELAN_MAC_ADDR` and `HW_HWVER`
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* Reboot (in telnet)
* Reflash again with `V2801F_V1.9.0-201104.tar` (must do after fix `VS_AUTH_KEY` )
* Enjoy!
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# Auto Reboot Fix
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## V2801F
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### Issue
* Invalid `VS_AUTH_KEY`
* Changing MAC Address `ELAN_MAC_ADDR` can cause wrong `VS_AUTH_KEY` value
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### Fix
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* You need to generate new `VS_AUTH_KEY` when change `ELAN_MAC_ADDR` and `HW_HWVER`
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* Apperently, you have few seconds to access Telnet before rebooting
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* To prevent auto reboot by entering `echo 3 > /proc/fiber_mode` (XPON Ethernet Mode)
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> If you can't type fast enough, use this autoit script `quick_telnet-login.au3`.
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>
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> Take a look some generated [`VS_AUTH_KEY` here](Docs/VS_AUTH_KEY.md)
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### Note
When `echo 3 > /proc/fiber_mode` is set, you lose telnet acccess, you need to unplug fiber to get back
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## TWCGPON657
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* No such problem, `VS_AUTH_KEY` does not exist.
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# 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 )
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* For a manual for the built-in Realtek `diag` utility, see: [RTKPONDiagShellUserGuide ](Docs/RTKPONDiagShellUserGuideV001.291982779.pdf )
* Source: https://usermanual.wiki/Pdf/RTKPONDiagShellUserGuideV001.291982779/html
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# Downgrade
If V2801F firmware not supported on TWCGPON657, you can downgrade via this url: `http://192.168.1.1/upgrade.asp`
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# 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
```
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* Update `md5sum`
```
md5sum fwu.sh rootfs uImage fwu_ver > md5.txt
```
* tar current folder
```
tar -cvf ../firmware.tar *
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```
