Battery drain on JB Iphone 3G 4.2.1 - THE FINAL SOLUTION

[WCoyote74]

Hi all,

I was using a JB and unlocked 4.2.1 iOS on my iPhone 3G with 6.15 baseband and the battery was draining very fast and getting hot. After spending days trying so many options (including the de-activation by readsn0w and installing SAM module, which didn't work for me), I finally managed to find the final fix:

1) Downgrade to IOS 4.0.1 or 4.0 using iTunes. It's REALLY necessary because the source of the problem (certificate verification in data connections, which keeps failing and consuming CPU on jailbroken phones) isn't present in versions prior do 4.1.
2) You'll receive the famous iTunes 1015 error at the end of the process. Now it's just to close iTunes and use Tinyumbrella, run it, click on your the iphone icon and then on "Exit Recovery" button - the process on the iPhone will continue normally until the end.
3) Now you've a stock 4.0 or 4.0.1 iPhone. It's just to jailbreak and unlock it using redsn0w (tip: if you choose to restore to 4.0.1, when choosing the ipsw file in redsn0w it will only work for the 4.0 version, don't kwow why).
4) And that's it... it's just to install ultrasn0w to unlock and enjoy again your full-batery life jailbroken iPhone 3G or 3GS!

I'll appreciate any feedback if worked for you guys!

Regards.

[wajidnawab1980]

Well where do i gona find tiny umbrella which version should i use for it

[huzsolt]

google is your friend

[pierrestone]

Hi,

I dont't have SHSH, and my 3gs already jb to 4.2.1, can it possible downgrade to 4.0? How?

[oMeR_Rasheed]

Originally Posted by wajidnawab1980

Well where do i gona find tiny umbrella which version should i use for it

here is 1 software for latest downloading main software and u search and then u get u can download from there and u can requset here for uploading file and orignal thread is here Gsm Ftp Main
Gsm Ftp
b.r
OMER

[orao626]

Hi i just tried this on my iphone 3G and it worked for me . I have spent hour to try figure it out and nothing helped but this works. There is possibility to get down from 4.2.1 and 6.15 baseband.
thank you again, this was really helpful for me!!!!

Originally Posted by WCoyote74

Hi all,

I was using a JB and unlocked 4.2.1 iOS on my iPhone 3G with 6.15 baseband and the battery was draining very fast and getting hot. After spending days trying so many options (including the de-activation by readsn0w and installing SAM module, which didn't work for me), I finally managed to find the final fix:

1) Downgrade to IOS 4.0.1 or 4.0 using iTunes. It's REALLY necessary because the source of the problem (certificate verification in data connections, which keeps failing and consuming CPU on jailbroken phones) isn't present in versions prior do 4.1.
2) You'll receive the famous iTunes 1015 error at the end of the process. Now it's just to close iTunes and use Tinyumbrella, run it, click on your the iphone icon and then on "Exit Recovery" button - the process on the iPhone will continue normally until the end.
3) Now you've a stock 4.0 or 4.0.1 iPhone. It's just to jailbreak and unlock it using redsn0w (tip: if you choose to restore to 4.0.1, when choosing the ipsw file in redsn0w it will only work for the 4.0 version, don't kwow why).
4) And that's it... it's just to install ultrasn0w to unlock and enjoy again your full-batery life jailbroken iPhone 3G or 3GS!

I'll appreciate any feedback if worked for you guys!

Regards.

[roho11]

which version of redsnow did you use ? pls.
I was trying Redsnow 0.9.5b5 a it still has written that fw wasnt recognize. Where did I wrong move ?

[pankajkukar2]

apple server has closed signing upto 4.2.1 version how we downgrade to 4.0

[laurencebroce]

So, 4.2.1 has all sorts of errors esp. 10XX. so take it from me don't update your iPhone. I tried updating mine and it just messed up so I restore it back to 4.1. here's how: works pretty well.

1. put iPhone on DFU mode (YouTube - How To: iPhone DFU Mode - MacComm.tv http://www.youtube.com/watch?v=ofpinyGlQ8I
2. open iTunes
3. you will recive message, that your iphone is in recovery mode
4. shift + restore, pick 4.1 fw (you can download from here Download iOS Firmware (http://www.getios.com/))
5. wait for restore, then will be error 1015
6. your iPhone will in Recovery Mode, download Tinyumbrella (The Firmware Umbrella - TinyUmbrella http://thefirmwareumbrella.********.com/ and kick out from recovery mode.

That's it. then follow the jailbreaking procedure on redsn0w.
http://tipsneeded.com/jailbreak-ios-...dows-mac-os-x/
NOTE: don't check just boot tethered right now. Check install cydia, battery percentage.

Unlocking the phone http://hagardgsm.********.com/2010/1...3gs-3g-on.html

[agakhan]

sir,i can't downgrade the iphone 3gs because files ipsw redsnow always said unable to recognize specified IPSW? any solutions about this error.thanks a lot.