I have:
M96 & M96+ Kit Kat from: 2015-11-29 & 2017-05-02:
M96_KK_2015-11-29_19-41_dev_6b96172_eng.zip
M96_KK_2017-05-02_19-37_dev_fbc2cc2_user.zip
M96 & M96+ Ice Cream Sandwich from: 2014-09-30 & 2015-11-12:
M96_2014-09-30_21-42_1.6.4_7efa90c_user.7z
M96_ICS_2015-11-12_01-52_dev_ac7be75_user.zip
T68+ (maybe T68 too) Kit Kat from: 2015-11-10 & 2017-05-02:
T68_KK_2017-05-02_20-53_dev_fbc2cc2_user.zip
T68_kk_2015-11-10_01-00_dev_4712b06_eng.zip
T68+ (maybe T68 too) Ice Cream Sandwich from 2017-05-03:
T68_ICS_2017-05-03_05-49_1.8.2_e54efe5_user_1.8.2.zip
T68_ics2015-11-11_00-14_dev_ac7be75_user.zip
These are the Mfgtool2 zip files from the old ereader store (Booxter's). The names were changed because they used to be more generic and I couldn't tell which was KK & which was ICS. Or maybe it was M96 & T68 I added. Or both. I forget. The M96 7zip file also has an update.zip in it. Not sure if it came that way or I did it myself.
Personally I've been using the older KK image without much issue, but I don't use the Onyx apps. I believe some problems were reported with the newer ones for some people so I never bothered to 'upgrade' mine.
These are mega links, but I've never tried sharing via Mega before, so I have no idea if I've done it right. Let me know.