The upgrade from 1.4.3 to 1.4.14 had an issue with persistent db location.
This caused the db to be held only in RAM and not backed up to flash.
If after the upgrade to 14.14 the nodes were reset and rejoined this would only remain until reboot.
Upgrading from 1.4.14 to 1.4.16 fixes the persistent location but the sessions made to 1.4.14 were lost with RAM and could not be recovered after a firmware upgrade.
Upgrading from 1.4.3 to 1.4.16 should maintain the session information
from the previous version. End-device with unique appkeys registered through ‘lora-query -a’ command will be saved to /home/root/whitelist.jsonlines. They will not be able to join the network until the list is imported into the API.
See Upgrade Guide