SN is just hard-printed on the back; build and ver num, etc., depend on and come with the firmware.
To flash Lepi's, you must first flash his TWRP and you'll need scatter file, don't know if you can find somewhere scatter file for your 1.3 ROM, check very old posts about modding this tablet - I'd rather suggest ro upgrade first to the more common official 1.8.
Before flashing, make sure tablet is fully charged.
There is a good guide::
http://freaktab.com/forum/tablet-sup...s-windows-7-64
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