Firmware updates and calibrations frequently lead to problems. If your firmware is current, there is no need to update. Many members don't update unless there is some performance issue with the currently installed firmware, or the new firmware has some feature you actually want to use. This image shows the latest H Plus firmware for the US. This version was issued in early 2019.
Calibration would likely be a no-no in your case.
Calibration is there to calibrate new components when installed. It is not there to overcome maintenance issues. If your controls are not working properly, you need to find and fix the problem. Using calibration for the wrong purpose may disguise an actual problem, and lead to much larger problems later.