[Koha] Koha Default being messed up

[Decka David]

Hi Koha team,
 
Thank you for ever support in this forum. I just install Koha 3.20 and
messed up the default MARC framework during the MARC customization. How can
I get back the original default back? Can anyone in this forum point me to
the right place.
 
Thank you
 
Decka David
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