On this unit there are two parts that do not interfere one with the other. The OS part and the multimedia part. So doing a reset of the Android part only is equal to a fresh install without wiping oout the multimedia content.
The video Charbax posted is good for the A5 Gen6, not for this one.
Sorry to give wrong advice to forum users on how to clean install.. Hopefully, the recovery formatting tools cannot harm the device but is just a waste of time for users who have to backup their files first when it's not required.
I don't think it was bad advice, at least not for me..... I went from a very buggy unit to a very stable one in about a half hour and that includes over 15GBs of
Battlestar Galactica 4.0 and 4.5 video getting reloaded. Though not totally perfect, it's the best to date...... I can now format an SD card and the accelerometer's now know which way I'm holding it, my bluetooth mouse work great and the WiFi is working fine. But there are still some little bugs, the unit locks up when I pull it from thr DVR station after doing a recording, I'll try powering down before hand, next time. Also when I played the video the headphones didn't work, the sound was coming from the speaker and in the settings it was grayed out so you could not switch to the headphones. I rebooted the unit and played the video again, this time the headphones worked fine. Some small bugs, but bugs none the less...... I hope for a new update to fix these problems.