Mini z offset out of calibration

My mini z offset went out of calibration. I have the older version of the lulzbot mini. I don’t have the lcd screen. Really confused what to do. Need some help from the pros. I was thinking of clearing out the rambo board if I can and start from scratch with an older version of the firmware. This all started when I updated to the new version of firmware.

Updating firmware will overwrite eeprom settings if you have it enabled. Unless you know your previous z offset you will need to do some testing to find your new correct z offset. ohai.lulzbot.com has the general calibration checklist for the mini. You will need to send the gcode commands over the console to the printer. If you don’t use the M500 it will reset to default everytime you power on.