> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/command-centre-releases/release-history/supported-gallagher-command-centre-releases/command-centre-9.20-releases/9.20-maintenance-release-1.md).

# 9.20 Maintenance release 1

Enhancements in this version are as follows

| **Tech Ref** | **Description**                                                             | **Component** |
| ------------ | --------------------------------------------------------------------------- | ------------- |
| 141853       | 9.20 Post OpenSSL 3.0: Restore Memory Tracing capability for MemStats types | Controller    |
| 144395       | Add network details to diagnostic web page                                  | Controller    |
| 145331       | Reader compatible with Apple pass v1 and v2                                 | Controller    |
| 148206       | Status and Alarms based on NIC Bonding setup                                | Server        |
| 148209       | NIC Bonding for C7000 Enhanced                                              | Server        |
| 148735       | Implement the Command Centre change to enable Sensor Bus                    | Client        |

Bug fixes in this version are as follows.

| **Tech Ref** | **Description**                                                                               | **Fixed In**       |
| ------------ | --------------------------------------------------------------------------------------------- | ------------------ |
| 138351       | Hangs when adding or deleting a card                                                          | Server             |
| 139280       | T20 Terminal: Pressing the 'Mode' key followed by the 'Back' key on T20 is resulting in error | Controller         |
| 143849       | Controller memory low and keep restarting                                                     | Controller         |
| 144494       | T10/T20 unable to read third party Mifare Classic 1k                                          | Controller         |
| 144601       | Zone Count in awaiting status after site upgrade                                              | Server             |
| 144792       | Event notification Email Subject stays on default after custom set                            | Server             |
| 145154       | Operator can edit Revealable and Editable PDF in alarm viewer                                 | Server             |
| 145272       | Crash where WriteFields object is destroyed whilst in use                                     | Server             |
| 145752       | Memory Low Alarm on Controllers                                                               | Controller         |
| 146180       | Locker card events don't count to the disable inactive cards                                  | Server             |
| 146582       | Command Centre database template creation failed                                              | Workstation Client |
| 146653       | Command Centre service Crashing & Asserting                                                   | Server             |
| 146781       | Controller Upgrade tool Unhandled Exception                                                   | Config Client      |
| 147209       | Site is getting 400 bad request on PATCH query to REST, but 204 when resending same query     | Server             |
| 148178       | Exiting through door assigned to workstation with CODE crashes Command Centre Client          | Workstation Client |
| 148690       | The operator of a child division has access to Competency and Card of Root Division           | Server/Workstation |


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