I have same wifi problem after upgrading in ZT285_H8_1a_1GB_Android4.0_1205_V1.12.zip.
I found this link with 4 firmware différent for c94.
i found equally a CyanogenMod 10.1 ** ALPHA for cortex a9.
do you think i can install this version using the upgrade integrated function in this tablet.
In case of error, will it be possible to put the constructor firmware ?
Thank for your responses.
Finally, the last firmware ZT285_H8_3a_1GB_Android4.0_1224_V1.09.zip corrected my wifi problem and fix the battery level.
I think it was the version model of the tablet who made the difference