How to extract and save original firmware version from I3 pro C

[ddanos]

Hello everybody.
I have some issues with my printer (at the beginning of printing, the nozzle start from 5 mm above the bed).
So I try to upgrade the firmware (which is now 1.0.04) to 1.1.8. Before I do this, I want to extract and save the old one.
Mean time I open the 1.1.8 version with Arduino 1.0.1 and verify it with this errors results.
Please help.
Thanks.

[ddanos]

It's interesting: when I open and verify ''Getech i3 pro C (Marlin 1.1.8 for all)'' with arduino 1.8.9 I don't have any errors.

[ddanos]

Eventually, which is the last and good firmware version for I3 pro C ?

Getech i3 pro C (Marlin 1.1.8 for all).zip
or
Marlin_GT2560-PI3_Pro_C.zip
or
I3 pro C (GT2560 A+)
I3proC （ A+ board ）.zip


I don't know if my GT board is A+

[ddanos]

An example of nozzle position.