The Fresco reports an invalid firmware file on startup or continually reboots.
If the startup screen is blue and reports an invalid firmware file and will restart in 10 seconds, let the Fresco restart. Do not power cycle the Fresco manually, otherwise the Fresco will continue to report this message.
A firmware update could have failed or file became corrupted, the Fresco is reporting this and will attempt to delete the old firmware file upon startup. However, if the Fresco is restarted before the 10 seconds, the Fresco will not remove the corrupted file and continue to report this.