User's Guide

www.lm-technologies.com

LM074 SPP with GAP Central Application v1.1

5. LM074 Over The Air Firmware Upgrade Procedure

This section describes the procedure to perform an over the air firmware

upgrade for the LM074 module.

Users can use serial terminals like Hercules, HyperTerminal, Tera term or Putty

etc. for serial communication with LM074 module.

In this document, the term “new image” refers to the firmware image to which

the LM074 will be upgraded to.

The LM074 receives the new image from a peer device which is connected to

itself with Bluetooth.

The LM074 can receive new images over SPP profile only. The module does not

support other Bluetooth profiles to receive a new image.

5.1 Pre-requisites for Firmware upgrade:

5.1.1 New Firmware image:

i. New Firmware image is provided as “xxxxxxx.bin” file to user.

ii. User shall store this image on PC/Laptop/device used to connect

to the LM074 module for OTA upgrade.

iii. LM074 module can be upgraded with the image provided by LM

Technologies only.

5.1.2 Peer Bluetooth device requirements:

i. Peer Bluetooth device should support sending file over SPP profile

(some mobile applications may not support this).

ii. LM technologies has tested LM048/LM058 or LM074 module to

send the new image with Hercules utility from windows PC.

iii. Peer device should support pairing requirements.

iv. LM074 will connect only with Paired device hence receives image

only from paired device.

5.1.3 Pairing and Authentication of Peer device:

i. LM074 can pair with remote device with fixed PIN.

ii. LM074 can pair with remote device with dynamic PIN and MITM

protection enabled.

iii. For detailed pairing procedure of LM074 with AT commands,

please refer document “LM074 module Pairing procedure

R1.0.pdf”