Like @kennethlimcp mentioned, that’s safe mode. You should be able to OTA an application of your choice. It should automatically upgrade the system firmware, if it hasn’t already done so. During the process it’ll blink magenta for a while.
If you want to decrease the risk of failure while updating, you could update it manually using the CLI. Hook it up in DFU mode and issue particle update. It’s a lot quicker and less prone to error.
Give it a try and let us know if that worked for you 