Check of there are ROMs posted in xda forums.
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What's ur tablet too few info,if based on qualcom u need download probably edl version of stock ROM and then flash it,if mediatek then flashtool
Installiert twrp then lineage for your device. Usually there is a guide with the packet on the lineage Website.
If not officialy supported you need to pray someone on xda tinkered a Version together
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