The programs that need updates to protect themselves are those that are exposed to outside input, for the most part, with you not using the WiFi feature, that should not be an issue. Updating unexposed programs/devices is to correct problems with the original software or to enable new features. For your device and use, you should have the functioning and usefulness that you have now, for as long as you want with your current firmware. It would not be damaged or break, just because of using the firmware that is working for you now.
Luck;
Ken
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