I received a lot of questions about the DV4mini software upgrade on the Raspberry Pi 2, this video is showing how to do it easily. It also included the firmware upgrade procedure.
Note: In the DV4mini directory the Archives folder is not there by default, you need to create it. You can also just delete the older file you need to replace.
See link bellow for image download.
http://laboenligne.ca/?page_id=370
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Pascal VA2PV
Laboenligne.ca