The Lidl Parkside iron has a calibration mode (Patreon)
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I've not seen this officially documented, but there's a way to set a new bit temperature for these soldering irons that is done entirely from the single button on the unit.
After I made the video showing the hardware hack a few people sent me a copy of the same text, showing the button calibration mode. I'm not sure if it's documented somewhere, or if someone worked it out and put it on the 'net.
https://www.youtube.com/watch?v=ZkvocvlF8jw
Given that the other video was quite popular I may jump this one to the front of the queue and release it next to literally "strike while the iron's hot."