Help / Advice needed "universal" allwinner Android car stereo NAND problem. - Android Q&A, Help & Troubleshooting

Hello,
So im not a complete novice with rooting and such, have done it on several phones with and without issues and still fixed them.
But when it comes to unbranded stuff like this stereo im a bit lost and confused.
Heres some info on the stereo in question
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Pretty much a generic chinese stereo found on ebay.
Apparent specs were advertised as -
Operating System: Android 4.4:
ARM Cortex A7 Dual Core,
1.0GHZ CPU ,1
GB DDR3 RAM,
8GB NAND Flash
This is not entirely true though and this is where my problems come in.
Booting into recovery doesn't actually allow any selections and it boots into recovery for about 3 seconds and then reboots.
The only info it shows in these 3 seconds are -
wing_k70-eng 4.4 KRT16S 20141208 (i assume this is a custom android version)
volume up/down to move highlight; enter button to select.
Reboot system now
apply update from ADB
wipe data factory reset.
(now i cant even try this because it reboots itself before you can try and select anything, also whats the up/down volume buttons and enter button on a stereo)
Boots with an allwinner logo.
Now thats the info on the stereo itself. The problem i have is with the storage. Again i dont know a ton about NAND. But the advertised specs stated 8gb.
When you look in storage in the settings it shows -
Internal storage 0.98gb (this is where apps are installed, or would be is there was space)
Internal storage 4.50gb
This shows in the settings but is not accessible, you can format it but still cant access it.
Tried opening in file browsers but it says its not mounted. No option to mount or unmount it in the storage settings.
SD card port works fine. I have a 16gb card in it but i cant install any apps onto it.
Some apps such as Torque ODB require profiles to be saved into storage and also need access to storage.
This is not possible as the internal storage is not accessible, i get a message of -
Waiting for memory cars / storage to become accessible.
This times out after a while because the storage is not accessible.
So im not here for some help.
What are my options?
Would rooting the device maybe fix the issue? if so how woudl i go about rooting this?
Is there a way without root to change the settings of apps to install into SD card, i tried the regular options in settings and it wont let me move or save apps to SD.
Any other way i can gain access to the 4.5gb?
Hopefully somone can give me some advice.