it is not possible to install a bootable image in my a510 anymore. The log says:
I: Can't partition non-vfat: datamedia
I: Can't format unkmown volume: /emmc
No matter what I tried. That applies to all the stock images.
Here is what I did. To root the device I followed this howto:
Android-Hilfe.de - Einzelnen Beitrag anzeigen - [A511] Root - Diskussionsthema
That worked without problems. After that I had, and still have, a working CWM-Based Recovery v188.8.131.52. Next step was installing a CM-image (instead of doing a backup first, silly I know). It was the cm-10-20121111-UNOFFICIAL-a510.zip. The result was a system which doesn't boot. I just tried that again. Everything looks fine and then it hangs at the Acer screen for ever.
After that I tried to flash stock images. No avail, see list of images.
I did this already:
-vol up power lock to do a wipe
-inst from SDCard
-inst via sideload
-in fastboot mode: fastboot erase userdata
-all kind of wipes
So, the Acer images do not install at all and the CM ones install but do not boot.