1 - Flash Firmware
2 - Connect Octoprint and send:
M502
M500
3 - Reboot Printer
4 - Auto Home
5 - Bed Level
6 - Connect OctoPrint to change offset see https://www.youtube.com/watch?v=GJiuji4d80M
Move Z to 0 position
Set fake zero
G92 Z10
Disable software endstops
G211 S0
Put a piece of paper under the nozzle and use the LCD controls to step down the nozzle over paper, next get the value from LCD or from terminal
M114
Enable software endstops
G211 S1
Calculate the Z-offset:
10 - [value] - 0.1 = 3.2
Put the negative value as z-offset (-3.2)