Direct upgrade from 3.50 official to 3.90-M33 using Lumines exploit?

[ConstyXIV]

I've got a 3.50 classic PSP sitting on my desk, eagerly awaiting a copy of Lumines to downgrade it to 1.50, then to 3.90-M33. I want to know if it's possible to use the "downgrader" to directly jump from the official 3.50 to 3.90-M33, without following the 1.50->3.40OE->3.52M33->3.90M33 upgrade chain? I don't have any friends currently in the state with a CFW'd PSP, and I don't trust myself with a soldering iron, so Pandora's Battery is out of the question.

[Yrkoon]

as far as im aware there is no way to do a instant upgrade like that.

the lumines method is pretty safe as long as you follow the instructions and ask about any thing your unsure of in the instructions :)

ive used it to downgrade about 6 psp's with no problems :)

edit i actually went from 3.50 ofw to 1.50 then straight to 3.52m33 on my mates one you don't need to use 3.40oe-a.

once your on 3.52m33 get update 4 for it and install it following instructions then you can go up to any of the newer firmwares from that point :)

3.50>1.50>3.52m33>3.52m33-4>to any newer one :)