Edit:
These ROMs are NOT compatible with a A13 tablets like the Trio Stealth Pro 7C. If your tablet does not have a working HDMI port, do
not install these ROMs.
I've posted several packages to my GoogleDrive. All of them can be had from this folder:
Trio7-A10 There are different versions of these packages depending on whether your g-sensor is a bma250, an mxc622x, or an mma7660. The first two are below, the third (with the mma7660) is described in another post:
ROM for WiFi-challenged Trio A10 Tablets
Two of them contain raw disk images taken from near-virgin tablets. It's up to you to get them installed (e.g.
cat bootloader.img > /dev/block/nanda). They are:
trio7-a10-bma250-stockimg.zip and
trio7-a10-mxc622x-stockimg.zip
A better choice for most people is the combination of a LiveSuite image to prepare the tablet and an update.zip to install a stock JB (4.1.1) with extra features.
LiveSuite Images -
trio7-a10-bma250-dopa-v2.img and
trio7-a10-mxc622x-dopa-v2.img
Each .img repartitions the tablet's NAND to increase the size of the /system and /data partitions, then installs a bootloader, CWM 6.0.2.8 recovery, and a temporary boot partition. The first time you boot after flashing, it will format various partitions then reboot into CWM so you can install an update.zip.
Note: The .img file is only 25mb because it contains no usable /boot or /system partition - you
must install either my JB package or another package such as CM10,
Update Zip -
trio7-a10-jb-dopa-v2.zip
This installs a stock JB 4.1.1, the basic GApps (including PlayStore), and a few useful apps like ESFileExplorer. It is fully rooted and provides init.d support. Beside adding a few tweaks taken from CM10, init.d is used to install the proper gsensor driver and support files, and to move the dalvik-cache to your /cache partition, freeing up 75+mb on the /data partition.
Note: Neither this version of JB nor CM10 will fit into the stock ROM's 256mb /system partition. If your /system partition is already larger (300mb minimum), you can install this zip without using the LiveSuite image - it will not touch your /data partition.
bma250 or mxc622x?
Good question, few easy answers If you're still using the stock ROM (and are rooted), look in
init.sun4i.rc in the root folder to see which driver is loaded. Otherwise... The older your tablet is (at least 6-8 months), the more likely you are to have the bma250. If you've installed numerous ROMS and have never been able to get the gsensor to work, you probably have the mxc622x. If you've never been able to get WiFi to work with any ROM you've tried, you probably have an mma7660 and should refer to the post described above. If all else fails, try both LiveSuite images (you will have to reinstall JB if your first attempt fails.
DoPa