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---
title: Zyxel PMG3000-D20B
has_children: false
parent: ONT
---
# Hardware Specifications
| | |
| ----------- | ------------------------------------ |
| Vendor | Zyxel |
| Model | PMG3000-D20B |
| Alias | |
| Chipset | Lantiq PEB98035 |
| Flash | 8 MB |
| RAM | 64 MB |
| System | OpenWRT |
| HSGMII | Yes |
| Optics | SC/APC |
| IP address | 10.10.1.1 |
| Web Gui | ✅ username `admin`, password `1234` |
| SSH | ✅ username `admin`, password `1234` |
| Form Factor | miniONT SFP |
Once you access the stick via ssh you will be challenged with a second tier login. The credentials to access the zyxel shell are: username: `twmanu` , password: `twmanu`.
From the zyxel shell you can escape to a standard linux shell via the `linuxshell` command
## Interchangeable firmware with
- [Zyxel PMG3000-D20B](ont-Zyxel-PMG3000-D20B)
- [Halny HL-GSFP](ont-Halny-HL-GSFP)
- [D-LINK DPN-100-Rev-A](ont-D-LINK-DPN-100-Rev-A)
- Zisa
- T&W
# List of software version
# List of partitions
| dev | size | erasesize | name |
| ---- | -------- | --------- | -------------- |
| mtd0 | 00060000 | 00010000 | "Boot" |
| mtd1 | 00010000 | 00010000 | "Env" |
| mtd2 | 00390000 | 00010000 | "ImageA" |
| mtd3 | 00390000 | 00010000 | "ImageB" |
| mtd4 | 00060000 | 00010000 | "Config" |
| mtd5 | 00010000 | 00010000 | "SECTION_EGIS" |
| mtd6 | 00250000 | 00010000 | "rootfs" |
| mtd7 | 00020000 | 00010000 | "rootfs_data" |
This stick supports dual boot from `ImageA` and `ImageB` witch contains the rootfs.
# List of firmware and files
## Useful files
- `/var/config/ont.sys` used to customize various settings on the stick
# Useful commands
# Useful commands
*Note: all commands start from the twmanu shell*
## Change the ONT S/N
*Note the S/N is in ACII format*
```sh
manufactory
set sn ALCLf0f0f0f0
exit
hal
set sn ALCLf0f0f0f0
```
## Change the ONT PLOAM password
*Note: the PLOAM is in ACII format*
This can be done easily via web ui. If you prefer to do it via the shell use:
```sh
manufactory
set password PLOAMPASS
```
## Change the ONT equipment ID
*Note: model number must be 20 no more than chars total*
```sh
manufactory
set equipment id MYEQUIPMENTID
exit
omci
equipment id MYEQUIPMENTID
```
## Change the ONT hardware version
```sh
manufactory
set hardware version 3FE49165BFAA01
```
## Change the software version
Edit the /var/config/ont.sys via vi directly on the stick itself. The file is CRLF terminated, one entry per line.
The entries for the software version are:
```
SW_VER0:0xabcdef
SW_VER1:0xabcedf
```
*Note: it's better to enter the software version in hex format, all lowercase precedeed by 0x.*
# Low level modding
## Create a new rootfs
The stick has a tricky image packing method, fortuntaly it has been reverse engineered. A script to help you create a custom rootfs can be found here: [https://github.com/nanomad/zyxel-pmg-3000-mod-kit](https://github.com/nanomad/zyxel-pmg-3000-mod-kit)
## Flash a new rootfs
*Note: all commands start from the twmanu shell*
- Transfer the new mtd on the stick via tftp
```
linuxshell
tftp -gr mtd2.mod.bin TFTP_SERVER_IP
```
- Flash it on the standby partition.
You can use `system` and then `show actimage` to get the current active image. Check `/proc/mtd` for the right mtds. Usually:
- if the currect active image is A the mtd in use is mtd2
- If the current active image is B the mtd in use is mtd3
```
linuxshell
mtd -e /dev/mtd2 write /tmp/mtd2.mod.bin /dev/mtd2
```
- Switch to the new image
```
system
set actimage a
```
- Reboot the ONT
```
system
reboot
```
# Miscellaneous Links
- [https://github.com/xvzf/zyxel-gpon-sfp](https://github.com/xvzf/zyxel-gpon-sfp)
- [https://github.com/nanomad/zyxel-pmg-3000-mod-kit](https://github.com/nanomad/zyxel-pmg-3000-mod-kit)
|
