Hey Ninebot, Xiaomi, Segway Mini / Mini Pro users, here is the downgrade pack for your device (Xiaomi, Ninebot, Segway Mini / Mini Pro) with an documentation how to do it. It will downgrade your device from firmware version 1.2.8 back to 1.1.7. YOU DO THIS AT YOUR OWN RISK, I'M NOT RESPONSIBLE FOR BRICKED DEVICES OR THINGS THAT HAPPEN TO YOU OR YOUR DEVICES BECAUSE OF THIS DOWNGRADE! It looks like Ninebot has changed something in the App. You need the Ninebot App < 3.6. For Android you will find the old APK's here  apkmonk.com/app/cn.ninebot.ninebot/#previous Please read the "NineBot Mini Downgrade Readme.pdf" insite the 9BDgrader.rar Just to be sure, that Ninebot (the company) has the right file on their server, here are the hashes from the original  Mini_Driver_V1.1.7.zip
MD5 Checksum: 94273806959B2BB5FD8C50F6F7323846
SHA-256 Checksum: 2A7743E35DE0136DE46FC2A2D6BA9187CB728738C6F8D7FCC022BD4CA05FED57 When you download this file from Ninebot, check if the checksums are the same. Upload the "Mini_Driver_V1.1.7.zip" here http://onlinemd5.com/ if the checksums are identical you are safe. Good Luck!

Posadis Server has to be downloaded from here: http://prdownloads.sourceforge.net/posadis/posadis-0.60.6.exe
After the Download, install it to C:\9BDgrader START WEBSERVER ISSUES:
Please take a look at c:\9BDgrader, there is an error_log. Open the File with the Notepad.
When it looks like this, there is another webserver like Xamp, Wamp, Apache or ISS running on your machine. Please disable this webserver temporally
[09/Jun/2016:14:06:16 +0200] Failed to bind the socket, error #50.
Probable reason is that another daemon is already running on the same port (80).
____ SKYPE uses Port 80 too. Please close Skype, kill the Skype process in taskmanager and try again.
- After you change the DNS Server on your Android Device please reboot your device, then open the Ninebot App for the downgrade

- Completely close the Ninebot App (kill the task)
- Change the DNS Settings in IOS to your Server
- Enable Flight Mode (this will wipe the DNS cache)
- Disable Flight Mode Open Ninebot App, it should now see the new 1.3.0 Firmware (which is our loved 1.1.7). ---

IT IS NOT SAVE TO USE A PRE CONFIGURED DOWNGRADE SERVER FROM SOMEONE ELSE. THE OWNER OF THAT SERVER CAN SEND YOU ANY FIRMWARE HE WANTS. THIS CAN BRICK YOUR DEVICE. IF YOU USE SOMEONE ELSES SERVER, YOU HAVE TO TRUST HIM!   INFORMATION: Some routers have an option to prevent the use of alternative DNS Servers for security reasons. You have to disable this option during the update Process in your router. List of routers: - some vodafone routers (Information will follow)   Denniss aka Ninehood :-) 9BDgrader.rar   You will find questions and success storys about the downgrade here: