you cannot remove the memstick after starting the upgrade , i t aborts!
if you bypass the switch / check the psp checks the version at 0% 35%
and again before writing the ipl ///

so this will not work..

you cannot use sx changer on version 2.XX as it writes to a file index.dat / version.txt wich are read only on version 2.xx, and sony has put a third check in a partition that we can not even read.. flash2 ?? 1mb

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