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# Modify
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You need a Linux PC/VM, Ubuntu as Operating System
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## Prerequisite
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You need these program installed:
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* `tar` (extract tar package)
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* `squashfs-tools` (extract/repack rootfs)
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* `qemu-user-static` (run MIPS VM)
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## Extract firmware
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* Extract Firmware package in `tar` format, we need `rootfs` file
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* Extract `rootfs` partition
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```
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unsquashfs rootfs
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```
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## Repack firmware
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* Repack `rootfs`
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```
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mksquashfs squashfs-root rootfs.new -b 131072 -comp lzma
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```
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* Rename `rootfs`
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```
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mv rootfs rootfs.old
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mv rootfs.new rootfs
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```
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* Update `md5sum`
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```
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md5sum fwu.sh rootfs uImage fwu_ver > md5.txt
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```
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* tar current folder
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```
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tar -cvf ../firmware.tar *
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```
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# Flash
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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.
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## Steps:
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* Downgrade your TWCGPON657 to version B13 or below.
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* 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`)
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* 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)
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* Reflash again with `V2801F_V1.9.0-201104.tar` (must do after fix `VS_AUTH_KEY`)
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* Enjoy!
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# Auto Reboot Fix
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## V2801F
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### Issue
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* Invalid `VS_AUTH_KEY`
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* 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](VS_AUTH_KEY.md)
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### Note
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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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