cant retain toner saver when printing. reverts to default?

I have to use toner saver and in all my printers I have had. I noticed that my printing is bold and when I set Toner saver print it reverts to general. I cant read the serial number as I have a bad back and need to be a contortionist to see it. The model is DR2425? uses toner TN2450. That is all I know at present without doing a day's search for invoice. Can anyone help please ? Has it happened in other models. Cant use Brother support without my model; number and it is stuck on select

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