How can i downgrade from osx 10.8 to 10.7

i need removing mountain lion dev preview 1. crashing everything... please

 

you need clean install 10.7 recovery partition.
following guide 10.6, same rules apply 10.7 once have booted lion recovery partition.

to create clean install (formerly known erase & install) of mac os x 10.6 snow leopard (the 29 usd upgrade dvd working retail version of mac os x , not need prior installation of mac os x on mac), follow 1 of following guides:

• short version: clean install of os x 10.6 snow leopard
• long version: mac os x v10.6 snow leopard: how erase , install

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os x lion: lion recovery
lion recovery disk assistant


guess, haven't backed before installing os x 10.8 mountain lion?

 

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