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You must login or register to view this content. i checked the min frimware its 2.70

If you follow this it will show you what fw your ps3 was shipped on. And if it's 3.55 or below you can.

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i did this its 2.70 ... can i patch the backup to 4.50 cfw ?

Yes you can, but please note that this slom model is harder to downgrade then anyother slim.
The nor chip is a litt,e different

How is it different? last time I downgraded a ps3 I just made a backup and then patched to 4.50 and downloaded rogero 3.50

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Yeah its fine. Just update to Sony 4.50 get valid dumps, patch dumps to 4.50 install.

the nor chip is little different then other slims, its rotated 90 degrees, and the e3 sometimes has trouble with it

So it means I can jailbreak 3.53 but when linking the e3flasher it will be different

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No the process is the same everything, i just want to let you know that making dumps on a cech20b might take more tries then on later model slims.
Im talking abouth clip way, if you solder there should be no difference

Yes, this model can be downgraded with the E3 Flasher.
What firmware is it currently on?

I agree with what MasterOwn3r saying that these models are pretty difficult since they require you to put the clip on a different way

From this:You must login or register to view this content.

to this:You must login or register to view this content.

and the clip might need more pressure on the clip since they really don't make contact with the chip.

"So it means I can jailbreak 3.53 but when linking the e3flasher it will be different "

Yes, just will be different and a little difficult to do it.