Warning!!!!
 

Do not update to 4.21 fw if u are on 3.55cfw!!!....cause u cant downgrade with the e3 flasher anymore,sony blocked itAs i found out the hard way:(

now, this is something interesting, you sure didn't mess a step or few ones?

Thanks for sharing and sorry to hear that... Usually, when Sony releases a newer firmware, it is confirmed that is safe to downgrade from. So far, I haven't heard about 4.21 ofw is safe to downgrade. Again, sorry to hear that.

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Were the necessary precautions taken beforehand?

You need to be entirely sure that every step taken during the downgrade procedure was done correctly before making incredibly bold statements.

Am certain cause i have tried to downgrade with my e3 flasher back to 3.55cfw for 8 hours straight and it keeps on saying metldr not supported,and i have downgradeed plenty consoles with my e3 flasher,and i did fit the clip correctly so yea we are ****ed,we me actually....lol

O_o Wow! : S Thanks for warning.

Sorry to hear that, raddog. :(

I just downgraded a cech-2001a a few days ago from 4.21 with e3 flasher.