You can try to install its ROM if you can find it.
Have you find the ROM? May be there is information where you find the ROM.
You can check http://www.needrom.com
It is very hard or impossible to find ROMs for unpopular Chinese phones and tablets.
It may be possible to re-mount the system partition as rw using ES File Explorer. Or use this one at:
https://play.google.com/store/apps/details?id=com.beansoft.mount_system&hl=en
New development version:13.09.18
LeWa_TCL_S950_JB2_ROM_13.09.18
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LeWa_KTOUCH_U86_JB_ROM_13.09.18
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LeWa_LA_M1_JB_ROM_13.09.18
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LeWa_AMOI_N828_JB2_ROM_13.09.18
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LeWa_AMOI_N820_JB_ROM_13.09.18
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LeWa_AMOI_N821_JB_ROM_13.09.18
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LeWa_Jiayu_G4_JB2_ROM_13.09.18
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LeWa_Jiayu_G3_JB_ROM_13.09.18
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LeWa_Jiayu_G2S_JB_ROM_13.09.18
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LeWa_Jiayu_G2L_JB_ROM_13.09.18
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LeWa_Jiayu_G2H_JB_ROM_13.09.18