An other approach for AX 2009 to AX 2012 code upgrade.

Dear All,

I am performing a code upgrade from AX 2009 to AX 2012, the Microsoft solution is to follow the checklist of AOD code upgrade, but I couldn't use this solution there are a lot of .aod files i need ti import into baseline but I can't find there appropriate layer to use.

Is there an other approach I can use maybe by coding or using cmd? 

Regareds,

Hassan Khalil