[MTCB Android Head Units Q&A] krisboats:
Yeah, it's actually really easy. Get yourself link2SD installed onto the device from the play store. Then find a memory card of choice (i had a 32gb sandisk extreme lying around in the gopro bag) and partition it in the following way. Taken from here with some changes by me for this headunit in the steps below.

First install the mini Partition Wizard Manager. here is the download link.

insert the card reader into a card reader and open it in computer.

Backup all the files present on your memory card, as in the process of making a partition you need to wipe all the data on the SD card.

Open the tool you installed, and open the Memory Card in it.

Right click on it, and select the “delete” option.

Right click on it again, and now select the option “Create New”, Create a “FAT32” partition. This will be the part of the memory card, where all your media files will be stored. Adjust the slider to set the size of the storage partition, keep in mind that whatever is left will be your android apps partition size. I had a 32gb card and decided 7gb of apps would be plenty so set this data partition to roughly 22gb.

Then Select “Create as: Primary”

Then, right click on the unallocated remaining space on the card and create an ext2/ext3/ext4 partition ( if you are on stock ROM choose ext2). This is the place all your apps will be stored.

Then select “Create as: primary” (Make sure that it is both set as primary, because it will not be working if it is not set to primary).

And now click on the “Apply” button on the top corner, and wait for the changes to take place (took a while for 32gb card on i5 2500k pc). Congrats you have successfully partitioned the memory card.

Now your card is partitioned you need to use the link2sd app to manipulate the head unit into thinking the apps partition is all in one place.

Open Link2SD. You will be prompted to choose between ext2,ext3,ext4 and FAT32. Now if you have made partition using the above method choose “ext2”.

Then it will say, Mount Script Created. Now you Reboot your Phone. Using the latest apps at the time of writing this today the app prompts the reboot for you.

Once the unit has restarted, open Link2SD. If any message doesn’t appears, it means you succeeded.

Now go to Link2SD > Setting> Check the autolink. (to automatically move apps upon installation).

If you already have some apps, select “create link” ( be sure to check the files: app, dalvic-cache, and library files). I didn't check the files and simply uninstalled then re-installed the original apps.

Now to check the memory, select “Storage Info” . this will be showing you up the current status of your internal memory.

I'm not sure how vital this part is but i paid the low price for the link2sdPLUS program so that i could check the link data files as well.

And Final Congratulations, you are done, now you can install as many apps as you want.

I didn't have much space left on the unit when i first did this... maybe around 28gb and so my unit was still throwing up the no space message when trying to install new apps. I simply uninstalled a few apps, kodi etc to free up some space and redownloaded them. The new downloads were successful and as you can see below they've installed onto the SD card partition via link2sd. The app seems to install as normal then the status bar shows the link2sd information and you're good to go. Speed wise the apps seem to open just as quick and i haven't noticed any appreciable slowdown using the SDcard as an extension to the apps forlder. In fact i really went to town with games and apps today and it's still running smoothly, although this may vary depending on the quality of the SDcard used. You can see below the size of the ext2 folder getting bigger as more apps are installed and taken off the headunits built in app storage.

---------- Post added at 02:28 AM ---------- Previous post was at 02:11 AM ----------

Forgot to say, link2sd has some other cool functions like app storage info, buttons to move data, lib, apk files independently to the sdcard and it also has a bunch of other options i haven't tried yet.... one of which is to be able to force the unit into recovery mode. Thought that might be useful for people to know for further tweaking etc.

All in all though i'm very happy with my unit now. The only thing i would like is the option to recolour those red buttons at the bottom of the main screen, but that isn't exactly the end of the world. Downloaded Navmii earlier from apkmirrors as the playstore said it was incompatible. Seems to be a decent satnav that works well, has a bunch of features and has the option for downloading maps to storage (circa 350mb for uk and ireland) which means you can use the gps without a data connection easily enough. It also has a built in quick menu that can play the song files on the head unit so you can play, pause and skip songs without exiting the satnav software, seems quite a handy feature so far.

---------- Post added at 02:51 AM ---------- Previous post was at 02:28 AM ----------

If you root it you can use a root explorer and change the ADB settings for the screen size to cut off the bottom few pixels from being displayed/touchable. For something easier you could try the app called NOMone which offers a quick and easy screen size change. Mines the same, it seems the digitizer covers part of the screen under the bottom of the fascia as well but if you peak around it you can see the lcd hidden away behind it.