hi guys.. this is a short story, i have modified my openerp, such as xml, i modified xml file from frontend, in "Settings -> Technical ->..." menu, i don't modified it in backend or inside folder addons; i modified xml file (action) in database field, in table "ir_act_window", i didn't modified it in backend or inside folder addons, i modified phyton file in backend or inside folder addons. The conclusion is modified my openerp in 3 place, 1. frontend, 2. database, 3. backend.

first question, are those the correct ways of me? or there is any easier way?

Then i want to upgrading or reinstall my openerp, i want my modified file and database are applied to the new installation or my new upgrading openerp.

second question is, can i upgrade, reinstall openerp without delete my modified files in from my old openerp?

really need your help guys!!! sorry for my bad english..