# Introducing the Illumina NovaSeq X System
**Background**
Coinciding with the v1.3 NovaSeq X Control Software release, Illumina is launching the NovaSeq X Sequencing System, a single-sided version of the NovaSeq X Series platform.
**Important Notes for the NovaSeq X Sequencing System:**
* The instrument can sequence all available NovaSeq X Series Kit configurations.
* The instrument will be single-sided, and will only allow sequencing on Side A of the instrument.
* The NovaSeq X instrument is fully upgradeable to a NovaSeq X Plus instrument. The upgrade is performed by an Illumina Field Service Engineer (FSE) only. Contact your local Sales team for further information.
**Maintenance Notes for the NovaSeq X Instrument:**
* The System Check within the Control Software are programed to test side A only.
* The NovaSeq X instrument comes with 1 wash flow cell and 1 wash cartridge set to allow Side A maintenance washes.
* The Control Software allows the user to open the front doors for Sides A and B for the Air Filter replacement by clicking "Unlock doors" option in the Control Software > Settings.
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #9316), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000009316%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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