I dont know why you keep making posts for the same question, or jump in on some one else question to bring up your own. It seems to be one step forward then 20 back, I have given you help with print quality now we are back to firmware issues. Did you not keep a working copy of your firmware?
Also you seem reluctant to use google or read or try and troubleshoot your own problems. Yes we all like asking for help but sometimes the answer is right there, especially with the cheap hobby printers. Sadly these are sold as plug and play but they are not, they need a bit of knowledge and skill that can be found freely on the internet, not to mention the millions of videos on youtube to help you out.
So to help with this question google "geeetech prusa i3 pro b firmware"
The first link will take you to the geeetech forum with a list of firmware [
www.geeetech.com] if you have a look around on that forum im sure you will find some help too.
the third link will take you to youtube [
www.youtube.com] where a user will show you his selection of firmware and instructions and walk you through it
If you take one lesson from this I hope its to always keep a working copy of the firmware and make a copy before you make any changes.