Upgrade to avalanche backpacks with Jetforce's system. It is good to allow about 1-5 days for the update. The backpack must be fully charged for the upgrade. NOTE! Not all backpacks with Jetforce need to be upgraded. If your backpack's serial number is the following, the backpack should be updated: Less than 162480056590 163480157217 163480157318 If the serial number of the backpack is something else, the backpack does not need to be updated. Our customer service will help if necessary if something is confusing.