[MTCB Android Head Units Q&A] rickthecabbie:
This is the Step By Step Guide to how I solved my issue with the Internal Storage on my MTCB Android Head Unit.

These units come stock with a 1 GB internal storage partition and that was not enough for me, so I found a way to double it to 2 GB.

I am using a JOYING RK3188 800x480 head unit which I bought on amazon. This also worked on my Pumpkin C0250 RK3188 1024x600.

It worked for me, it may work for you.

I am not responsible for anything , EVER, ANYWHERE, IT'S NOT MY FAULT!

Seriously though, there are risks involved in this and I cannot be held responsible for what may happen if you choose to do this. YOYO

The tool is credited to WENDAL of Slatedroid. I found it here https://github.com/VeronicaEC/veronicaec.github.io/tree/master/MK808/Rockchip_TOOLS

Step 1: Create a folder called Stock, and unzip the tool into that folder and it will be in a folder called RK3066_IMG_Mod_Tool

This folder will contain a Temp folder as well as some .dll files, an app called "Runme" and a few other things. there are 21 files in all.

The most important of these for me are Temp, and Runme.

Step 2: In the folder STOCK\RK3066_IMG_Mod_Tool I placed a copy of the STOCK Unmodified firmware for my head unit, which is called "update.img" I then renamed this file to "wendal.img" (without the quote marks, because this is what the tool is looking for.)

Step 3: Next, I opened the app called "Runme" and a cmd window labled "Android Firmware Package Tool v1.3" opened on my desktop with instructions. 1-Unpack 2-Pack 3-Exit.

I entered 1 and pressed enter at the prompt to continue. This unpacked my firmware into the "Temp" Folder, then I entered 3 to Exit the tool.

Step 4: Inside the "Temp" folder were now 7 items, one of which is called "parameter" This was the only item I would be dealing with.

There may be other things I could change in here, but this thread is not about that. "parameter"is what I want, and "Temp" is where it is now located.

Step 5: So, now that I have the stock "parameter" file right where I want it I removed it. That's right, I pulled that little bugger right out of "Temp" and threw it away.

Step 6: At this point I needed a replacement for "parameter" and I needed to get it into the folder STOCK\RK3066_IMG_Mod_Tool\Temp

so I stole one from another firmware. I only needed a 2 GB patition for internal storage, and since I had a copy of the Malaysk ROM that was right for my unit, and that firmware had a 2 GB partition, I created another Folder on my desktop called "Malaysk" and unzipped a fresh copy of RK3066_IMG_Mod_Tool into that directory. This helped prevent confusion.

Step 7: Now I took that copy of the Malaysk Rom called "update.img" and placed it in the directory labled "Malaysk\RK3066_IMG_Mod_Tool"

Step 8: Then I changed the name of that img to "wendal.img" (because that is what the UnPack tool wants it to be called)

Step 9: It was time to open "Malaysk\RK3066_IMG_Mod_Tool\Runme" and unpack Malaysk Rom. into "Malaysk\RK3066_IMG_Mod_Tool\Temp" So I opened Malaysk\RK3066_IMG_Mod_Tool\Runme and once again entered 1 to unpack, then I entered 3 to Exit the tool.

Step 10: I opened the folder Malaysk\RK3066_IMG_Mod_Tool\Temp and there I found the new modified "parameter" file. I made a copy of this new parameter file and placed it in the folder STOCK\RK3066_IMG_Mod_Tool\Temp to replace the one I had thrown away.

Step 11: Now I was ready to repack the firmware I had in the STOCK folder. So I opened Runme from STOCK\RK3066_IMG_Mod_Tool and entered 2 for "Pack" to repack the firmware and pressed enter when prompted. This creates a new firmware file called "update_new.img"

Step 12: I copied update_new.img to the SD card for my Head Unit and renamed the img to "update.img" Then I flashed the firmware to my head unit using the method described in the firmware flash section of this forum.

Step 13: As I was reminded by jbleasdale below, whenever one is flashing a Rom to change any partition size on these units, it is necessary to do a factory/data wipe from the recovery menu on your first boot after the flash.