Glo How to come back in 2.1.4 with Glo ?

Hi,

Is someone know how to come back in 2.1.4 with Kobo glo ?

Have no problem when it was in 2.1.4... but too much with 2.1.5.
-Very slow when modify the fonts or texts options.
-Text become very blur after the page of the refresh (= only the page who have the refresh is ok).
Now I must use refresh on every page... before, a refresh every 6 pages was ok.
-When I open the read menu, choose a option who open a windows, and close it... the text who was under the window is more dark, bold and blur.
-Very slow when I try to select text for underline.
-Freeze many sec when it change of chapter.
-Freeze or reboot at random...
Have no one of this problem when I was in 2.1.4.

I know how to make a upgrade/downgrade manually... but don't know where to find à 2.1.4 firwamre for Kobo glo (only see for the touch).

If someone can help...
;)


PS/ Sorry for bad english level.