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Update firmware would be best option but is not recommended for inexperienced user, high risk of bricking printer and quite advanced method of unbricking it. I recommend to calculate new steps, use guide like:
https://reprap.org/wiki/Triffid_Hunter%27s_Calibration_Guide#Z_steps
and add command M92 mentioned by Balzac40 to startup script of your slicer software before homing command .
All that with assumption this is marlin firmware that is running your printer.