iPad iTunes error 20, trying to downgrade 4.3.5 to 4.3.3 (SHSH saved)

[gnychis]

I am using the newest version of TinyUmbrella (5.00.07), and trying to downgrade my iPad1 from 4.3.5 to 4.3.3.

I have the SHSH blob for 4.3.3 saved, and TinyUmbrella sees that SHSH blob. I have the TSS Server running in TinyUmbrella, then I start iTunes and select the 4.3.3 IPSW to restore from. It extracts the software, it requests the SHSH key, which I see TinyUmbrella catch:

07/28/2011 15:44:08.481 Wrote TSS response

However, iTunes then gives me an "error 20" and fails. I have tried several times and have had no luck. I have *never* been able to successfully downgrade using TinyUmbrella yet :\

 

[AppleFanatic10]

U have to change your hosts file. Here's a thread on how to change the file:

https://forums.macrumors.com/threads/1119612/

 

[gnychis]

a-ha, needed to be in DFU mode. Found this in TinyUmbrella comments:

- If you get de "error 20" message: connect your device to the pc, turn it off, and press power 3 seconds, then hold power and ome buttons for 10 seconds, and then only hold the home button. iTunes will say that a recovery device is detected.

 

[lundjohnson]

This worked for me as well. Thanks to this thread!

To downgrade iPod Touch 4G from 4.3.5 to 4.3.3.
TinyUmbrella (5.00.09) (default setting, no advanced mode changes)
Need to be in DFU mode. Found this in TinyUmbrella comments:
- If you get de "error 20" message:
connect your device to the pc,
turn it off,
and press power 3 seconds,
then hold power and ome buttons for 10 seconds,
and then only hold the home button.
iTunes will say that a recovery device is detected.
TU log
08/13/2011 18:39:03.604 DFU Device connected
Start TSS Server
08/13/2011 18:43:24.625 Wrote TSS response
08/13/2011 18:43:29.256 DFU Device disconnected
08/13/2011 18:43:37.886 Recovery Device connected:
08/13/2011 18:43:46.335 Recovery Device disconnected: null
It's working (no error 20)

 

[zacho56]

This worked for me as well. Thanks to this thread!

To downgrade iPod Touch 4G from 4.3.5 to 4.3.3.
TinyUmbrella (5.00.09) (default setting, no advanced mode changes)
Need to be in DFU mode. Found this in TinyUmbrella comments:
- If you get de "error 20" message:
connect your device to the pc,
turn it off,
and press power 3 seconds,
then hold power and ome buttons for 10 seconds,
and then only hold the home button.
iTunes will say that a recovery device is detected.
TU log
08/13/2011 18:39:03.604 DFU Device connected
Start TSS Server
08/13/2011 18:43:24.625 Wrote TSS response
08/13/2011 18:43:29.256 DFU Device disconnected
08/13/2011 18:43:37.886 Recovery Device connected:
08/13/2011 18:43:46.335 Recovery Device disconnected: null
It's working (no error 20)

BUUUMMPPPPP.

THANK YOU SO MUCH. IT ACTUALLY WORKED!!! Ive been at this for over 6 hours with error 20 man. Thanks a bunch!!!

 

[happypup6969]

Worked for me...
Thanks!

 

[unlimitedsway]

this worked for my sister the other day

 

[Alurous]

This worked for me as well. Thanks to this thread!

To downgrade iPod Touch 4G from 4.3.5 to 4.3.3.
TinyUmbrella (5.00.09) (default setting, no advanced mode changes)
Need to be in DFU mode. Found this in TinyUmbrella comments:
- If you get de "error 20" message:
connect your device to the pc,
turn it off,
and press power 3 seconds,
then hold power and ome buttons for 10 seconds,
and then only hold the home button.
iTunes will say that a recovery device is detected.
TU log
08/13/2011 18:39:03.604 DFU Device connected
Start TSS Server
08/13/2011 18:43:24.625 Wrote TSS response
08/13/2011 18:43:29.256 DFU Device disconnected
08/13/2011 18:43:37.886 Recovery Device connected:
08/13/2011 18:43:46.335 Recovery Device disconnected: null
It's working (no error 20)

I have a question, I somehow can't save my SHSH blobs. this appears everytime I try like 10 times: "12/19/2011 12:54:51.679 CYDIA DOES NOT HAVE YOUR SHSH FOR iPhone4 4.0 (8A293) THERE IS NO WAY FOR YOU TO GET THEM. SORRY. YOU ARE JUST TOO LATE."

I have tried doing the DFU mode, TSS server and all but it always gives me error 20. My host file has been modified, I have looked everywhere. Some say to leave it in default settings the TU, others says to uncheck the communicating with Cydia, other says to delete the code from Host file, other says to leave it other says to change the IP, others say to put the "#" infront of it @_@ idk what to do. I have an iPhone 4 in 4.3.5 and I want to downgrade to 4.3.3 :/ any idea what I should do? or another way to save my SHSH blobs, I've tried iFaith that saves it too but he only saves till 4.3.3 so 4.3.5 don't work on it.

 

[Hongkongfu]

if u dbt have shsh blobs for 4.3.5 you can not save them anymore because apple not sign this firmware anymore there is NO WAY

if you have 4.3.3 blobs you can downgrade make sure to start tts server , and make sure to unchek all options in advanced tab in tinyumbrella