EM160 FOTA FIrmware over the air upgrade

Is it possible, via AT commands, to upgrade from version 05 to 07 with routerboarb RBM11G ?

Thanks for your query in Quectel forums.
FOTA does not currently support full package upgrades, but can support DFOTA differential package upgrades.

hi, what is it, how to do it, I would like to update the firmware from v05 to v07