> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/server-and-os-administration/procedure-for-downgrade-from-rel2-7-to-rel2-6.md).

# Procedure for downgrade from rel2.7 to rel2.6

This page is the procedure to downgrade Toolpack v2.7 system to a Toolpack v2.6 system on a TMG3200 or a TMG800 unit.

**Warning**: Major downgrades require service interruption.

**Configure a valid DNS**

vi /etc/resolv.conf nameserver 8.8.8.8 <- Should insert a valid DNS here

**Download the proper v2.6 installer from TB site**

1- Download installer from TB download site - <http://download.telcobridges.com/> Contact TB support to get the complete link for the proper installer.

```
ex.  wget http://download.telcobridges.com/release2.6.85/TBToolPack-2.6.85-Linux-centos5-x86_64-Install --user xxxx --password yyyy
```

2- Change the permission of the installer

```
ex.  chmod +x TBToolPack-2.6.85-Linux-centos5-x86_64-Install
```

**Stop Toolpack Service**

```
tbtoolpack stop
```

**Run Toolpack Installer (same as 2.4)**

> [Toolpack Installer](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/api/installing-toolpack/README.md)

**Copy the license**

If not already done with the installation copy the license in the licenses directory

```
[InstallDirectory]/pkg/licenses/
```

ex.

```
/lib/tb/toolpack/pkg/licenses/
```

**Verify that the Toolpack service will start v2.6**

Open the following file with vi.

```
vi /lib/tb/toolpack/setup/12358/service/config.txt
```

Make sure that the 'application=' line contain '2.6'.

```
application= /lib/tb/toolpack/setup/12358/2.6/apps/tboamapp/tboamapp_wd_cfg.ini
```

**Start Toolpack Service**

```
tbtoolpack start
```


---

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