SENA Promi-MSP User Guide - Manual (Page 17)

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Copyright © 2006 Sena Technologies, Inc. All rights reserved.
 Once ROM file is delivered to the connected Promi-MSP, the upgrade firmware will be
recorded to nonvolatile memory. During this time both STATUS LED and ERROR LED
will flash speedily. NEVER turn off Promi-MSP during this firmware recording.
 Once finished, please resupply power to Promi-MSP for applying.
2.3.2 Firmware Upgrade via Xmodem:
Users may upgrade the firmware using Xmodem protocol via RS232 serial cable.
Note:
If you turn off Promi-MSP during firmware upgrade, Promi-MSP may be
damaged severely and irreversibly.