This tutorial provides an overview on all available methods of how to update the ELS61/PLS62 module. In total there are four options available as listed below: 

1. Firmware update via the customer application (using customer application's memory)
2. Firmware update via the customer application (using module's internal memory)
3. FW update via FOTA Midlet running on the module
4. FW update via IoT Suite

As every application is different there is a good chance that one of the options suits better than the other. The attached slide deck talks through the various options and discusses the advantages and disadvantages for each method. 

For an example implementation of the FOTA Midlet please reach out to your local Technical Sales representative.