automatically removing cfw

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What steps will reproduce the problem?
1. Copy uptade and fastrecovery to psp/game
2. run update
3.

What is the expected output? What do you see instead?
I expected to  see instalation screen, but i got it for 2 sec and automatically 
start removing cfw and restart with ofc. 

What version of the product are you using? On what operating system?
I have 6.60 09g, 660PRO-C2 

Please provide any additional information below.
Psp had before cfw on 6.35 pro b. last cfw wasn't deleted before update.

Original issue reported on code.google.com by [email protected] on 11 Jul 2014 at 10:41