If you still could'nt update,
even if you change to the four servers,
choose the lowest %,
and wait for days. 
Manual extract Download MxKv3.5r1.2NB.rar from Mirrorcreator - Upload files to multiple file sharing sites
Extract here
C:\mobileEx\3.5
MD5: BC003839DB151A51DAFF080FA4CCD5FF
SFX - Auto extract Download MxKv3.5r1.2NB.exe from Mirrorcreator - Upload files to multiple file sharing sites
run, click install
Default path
C:\mobileEx\3.5
MD5: D909D362183DF116132794436E6FE2C1
After extracting
run mxkey then click Synchronize Files to verify
*you must be using the latest version
v3.5 rev 1.2
Compiled & SFX by
-jmcobra23-
Source
I'm just trying to help, if it's against mxkey rules,
i apologize, you could delete my post.