As for IPsec issues, thank you for giving additional feedback, we are aware of the issue and currently are working on solving it.
As for retrieving default WiFi password without physical access to the devices if it was already changed, there really is no such option. What I could offer is either using SMS uci rules: https://wiki.teltonika-networks.com/view/RUT360_Mobile_Utilities#UCI_API_rule
And after reflashing the device to send sms with command to set new wifi password: <router_passwd> uci set <wireless......>=<new_password>.
Considering that after reflashing it would have default password message would be admin01 uci set wireless.default_radio0.key=<new_password>
another option would be adding devices to RMS and changing needed configurations through there, since you would be able to access them if they would have internet connection and each device has 30 days free trial.