Thank you for your questions.
- You can use FOTA web to download existing configuration from your device, re-configure using Teltonika configurator and upload new configuration back to the device.
- Device will not ignore configuration change. If you will make any changes in configuration file this will affect device's workflow.
Extra information about fota web you can find in Teltonika wiki page: https://wiki.teltonika.lt/view/Getting_Started
3 basic and safe steps:
Step1. Download config file.
Step2. Open with configurator, change settings and save.
Step3. Upload file to fota web and assign configuration to device.
If you do not have FOTA WEB access please contact your sales manager.
Hope this will help.