Okay, here's the new tutorial!
1. Download and reflash official firmware v1 (Linked)
2. Download and run PAIO1.8b(Linked), but when it wants you to activate Market Unlocker type y and press enter without really activating it.
3. On your tablet, download and install Root Explorer. (Edit: Root Explorer is a paid app, removed link.)
4. On your tablet, download and extract the zip (Attached) with Root Explorer.
5. Copy the files from the LLPermissions folder to /system/etc/permissions/, restart your tablet, then try Google Play.
6. If step 5 didn't give you the full store, go to apps in settings and clear data for Google Services Framework and Google Play.
7. Copy the files from the DSPermissions folder except g.prop to /system/etc/permissions/, copy g.prop to /system/etc/.
8. Restart your tablet and try Google Play again.
I have a PMID800 and step 5 did give me a full store.
My only question is my brightness is stuck at full all the time, are there any fixes for this?