3GS easy downgrade 4.01 to 4.0

[GSM Deals]

as we all know apple stoped signing firmware 4.0 only 4.01 is signed but you can still downgrade to 4.0
step1:connect iphone in normal mode then run umbrella-4.01.01 thick andvanced option choose "iphone 3gs 4.0 (...)"then click "saves my shsh" it will be saved locally
step2:connect your iphone in recovery mode in umbrella click on "start tss server"
step3: run itunes and restore using 4.0 firmware
regards

 

[bowram]

tryed but not succesfull ..

 

[lihua]

not work ????????????

 

[dArk_shAdE]

tested iphone 3gs 4.0 downgrade 3.1.3 05.13.04...using tiny umbrella...

 

[bcprathna]

As for this mean you have to got you 4.0 blob first. otherwise you can not downgrade,

 

[GSM Deals]

it's working ambrella can still save shsh for version 4.0 just restart umbrella after saving shsh check "display shsh" then start tss server
regards

 

[itexchange]

yesterday i just use shsh from 4.01 downgrade to 3.13.

 

[bonusphone]

Can you explain step by step?

 

[bowram]

please explain more how to downgrade 4.0.1 to 3.1.3....

 

[beling]

probably with old bootroom !!

can you explain the procedure please ?

Thanks in advance