After looking up tab up I would tend to think bt app will not be supporting it. It's a low end tab that may or may not have to have a seperate app . I don't know this to be a fact but judging by other customers that have tabs made in china who are not supported I think yours can be included on this list. The others have rockchip cpus which takes a lot of work to dev an app for them. I've seen or done anything with any allwinner devices but I still tend to think they will not be supported.
My cheapo Rockchip chinese tablet did not work with JB 4.1 VC011 error but works fine with JB 4.2
Thanks for all your comments, please can you let me know how to upgrade lto 4.2??? Any help is much apprecited