> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/instrumentation/nextseq-500-550/instrumentation-nextseq-500-550-troubleshooting-list/000001680.md).
# Troubleshooting an Async Firmware Operation Error on the NextSeq 500/550
This error is due to a transient communication issue that does not affect run progression or performance.
**Possible error messages:**\
"AsyncFirmwareOperationCommand timed out waiting for started after XX:XX:XX."\
"While waiting on an asynchronous firmware operation: camera bitmask 111111 Originally caused by: Failed XY Stage."\
**Troubleshooting steps:**
1. If the run is continuing, allow the run to complete and monitor.
2. After the run completes, review run performance. See [Specifications for the NextSeq 500/550 System](https://www.illumina.com/systems/sequencing-platforms/nextseq/specifications.html).
3. Power cycle NextSeq 500/550.\\\*
4. If the system initializes, proceed with the next sequencing run.
If the same notification is displayed over 2-3 consecutive runs, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support), for further assistance.
\\\*For further information, search for Knowledge Base Article **How to Perform a NextSeq 550 Power Cycle.**
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1680), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000001680%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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