[Koha] How to upgrade koha

[john smith]

Hi to all

I need to know steps to upgrade koha, I have backup to koha 1.2.3 and need to upgrade to koha 3 but i did not know how to convert data to koha 3, i read about convert by marcedit and read convert by upgrade to koha2.2.0 and to koha 2.2.8 to koha 3 please i need the steps to do upgrade please if any body know send to me all steps to upgrade.

thnks

 

John Smith

 

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