> 1.4 | General Requirements and Precautions

> • | The firmware download is only intended to install the same or a new firmware version. Trying to downgrade to an older version will be denied.

> • | Take every precaution to avoid disruption of the firmware download. Do not bend, stress or remove any cable. In the event of failure, there would be no valid software installed ‑ although the update process can be started again any time.

> • | For the download to be properly completed power saving must be switched off. Please take care that the ME is set to AT+CFUN=1 before launching the firmware download.

> • | See Section 2.7 and Section 3.3 for troubleshooting specific problems.