lexibook MFC142FR hardbrick

First of all I’m sorry for my english. Please help me, I need a firmware or a custom ROM which is suitable for my child hardbrick tablet.
This specification :
models: mfc142fr
os: android 4.1.1
Processor: 1GHz
RAM: 512 MB
LCD: CAPACITIF 7 "resolution: 800 x 480
WIFI: 802.11 b / g / n
dual camera 0.3 MP front and back
abi: armeabi-V7A
abi2: armeabi
board products: rk2928sdk
manufacturers: rockchip
building description: rk2928sdk_eng 4.1.1 JRO03H 20,130,930.160150 release_keys.

before I say many thanks…