[Q] Tablet Dawa D9. 3g blocked

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Hello,
improper handling and forgotten the pin code. My 3G is locked (device). With the first SIM card, I have put a code in the "SIM card lock" and I do not know. With my other two cards, I am asked to put the sim code (unlock sim card) and I do not know. How to reset this setting?
Already passed factory mode and nothing .... The little button hard reset nothing. Complete reinstallation with both Volume buttons and start ....
I do not know what to do, there is still no update 2.3 and I'm stuck because really need the 3G. There are Custom Rom? If yes, I could not even install it because I know enough about this kind of manipulation. Thank you for those who can find an idea

Hello,
There is no equivalent to a model Dawa D9?
I think it is possible to use the firmware from another shelf.
Tablet Dropad D10 seems to be none. Someone can confirm ? There may be a chance that this Rom works on my Dawa D9