Hello,
I'd like to downgrade my SGS3 GT-I9300 international running 4.3 (baseband v. I9300XXUGNA8) to the official 4.1.2 ROM.
I don't have an EFS backup from the days when I ran 4.1.2 previously so I'm thinking I will have to factory reset, flash the ROM up to 4.1.2, root, then restore user apps via Titanium. I don't think KNOX will be an issue; as far as I can tell it's not installed on my device.
My questions are:
Can I factory reset to avoid problems with the IMEI?
Will I be able to just restore apps installed under 4.3 into 4.1 and have them work, or will I have to reinstall each and every one from the Play store?
infraspace said:
Hello,
I'd like to downgrade my SGS3 GT-I9300 international running 4.3 (baseband v. I9300XXUGNA8) to the official 4.1.2 ROM.
I don't have an EFS backup from the days when I ran 4.1.2 previously so I'm thinking I will have to factory reset, flash the ROM up to 4.1.2, root, then restore user apps via Titanium. I don't think KNOX will be an issue; as far as I can tell it's not installed on my device.
My questions are:
Can I factory reset to avoid problems with the IMEI?
Will I be able to just restore apps installed under 4.3 into 4.1 and have them work, or will I have to reinstall each and every one from the Play store?
Click to expand...
Click to collapse
You need a efs backup or use a mk6 or newer modem.
Why do you want to downgrade to this sds vulnerable version for?
http://forum.xda-developers.com/galaxy-s3/general/ref-imei-efs-stuff-i9300-including-t2393289
Also questions go in the q&a section.
Darke5tShad0w said:
You need a efs backup or use a mk6 or newer modem.
Why do you want to downgrade to this sds vulnerable version for?
http://forum.xda-developers.com/galaxy-s3/general/ref-imei-efs-stuff-i9300-including-t2393289
Also questions go in the q&a section.
Click to expand...
Click to collapse
I mainly want to downgrade because of performance issues with 4.3. When I back out of an app or hit the Home button, I frequently have to wait for several seconds before icons load. I've tried freezing as many useless bloat apps and services as I can but it hasn't helped at all.
I find it hard to believe that a factory reset will leave the device unusable as a phone... shouldn't the factory reset reset everything, including the EFS?
Try searching for just two minutes, you will find hundreds of posts where their imei was lost (permanently) by trying to downgrade -usually so they could unlock for free.
Factory reset only wipes data, nothing else. As above, flash only a firmware compatible with efs v2, EMG4 or later.
Backup your efs first, be prepared to pay for a repair if you get it wrong.
Your problem is a lack of free memory, dumping the launcher. Try one that stays resident.
Related
First Up: Sorry if this has been covered somewhere. I have searched and didn't find something close to this.
I bought the phone in India and it had KE8 by default.
I updated the firmware using Odin to KF3 (INU).
I rooted thru the CF method. And then reflashed using stock kernel for KF3.
So now, my specs are:
Baseband Version: I9100DDKE4
Kernel Version: 2.6.35.7-I9100XWKF3-CL276555 root - DELL101 #2
Build Number: GINGERBREAD XWKF3.
After this, I am now facing a lot of jerkiness and lag. Scrolling is not smooth at all, be it contacts, b/w application pages etc. It was absolutely smooth prior to the fw update. I tested also using angry birds, and the screen gets really jerky. Wake up screen, etc are all jerky.
Just feels like there is some process running in the background eating up memory, and thus causing the screen to behave this way.
Please help me out.
(If the solution is a factory reset, I know I will lose root, but will it revert to KE8?)
Who said Factory Reset will un root the device? So do it and see if the problem solves or not. I am using KF3 for more than a month now and it is a very stable and speedy firmware. And no, Factory Reset will not downgrade it to KE8, it will be KF3 after the reset.
Regards.
ithehappy said:
Who said Factory Reset will un root the device? So do it and see if the problem solves or not. I am using KF3 for more than a month now and it is a very stable and speedy firmware. And no, Factory Reset will not downgrade it to KE8, it will be KF3 after the reset.
Regards.
Click to expand...
Click to collapse
Thanks mate.
I see you have the same stats as I do. Vodafone Kolkata FTW !!
So just to be clear, I will not lose root, neither will the firmware get downgraded. It will only suffer from a wipe. Please do suggest a good backup method, or point me in the right direction.
Another thing, did you update using Kies or Odin? And what root mechanism did you follow?
Nope, neither.
I updated via Kies. I don't have that many apps installed and didn't need a back up for them, so I used Kies back up.
I used Chainfire root mechanism, which you can find under Original Android Dev section.
Besides, glad to know you are from Kolkata too.
Regards.
jainz84 said:
Thanks mate.
I see you have the same stats as I do. Vodafone Kolkata FTW !!
So just to be clear, I will not lose root, neither will the firmware get downgraded. It will only suffer from a wipe. Please do suggest a good backup method, or point me in the right direction.
Another thing, did you update using Kies or Odin? And what root mechanism did you follow?
Click to expand...
Click to collapse
Okay so I did a factory reset. Solved the problem completely. No lag/jerk any more. YAYYYY!!!
Used Titanium backup (free) for the backup. It backsup the apps to the internal memory, and the hard reset doesn't wipe the internal memory. The only pain in the free version is restoration while still a batch process, requires you to individually say yes to each app being restored.
So now I have a rooted SGS2 with KF3, and no lag!!
Time to check out some custom roms
Hi Everyone.
I have a Samsung Galaxy S2
Kernal WXLP4 optus firmware.
I rooted the phone and stupidly let my son play with it and he has deleted important firmware apps such as Touch whiz and other things that are making my phone almost unusable.
Unfortunately there is no firmware repair on kies so i was wondering if anyone had any recommendations on what to do. I did a factory reset and it does not restore these important firmware files unfortunately.
Any help would be great.
Not sure what you have, but if you have Titanium Backup, you can restore the apps. Or if you have done a nandroid backup, you can also restore it. Last, if all things fail, I guess you will need to find the same firmware and use Odin to reflash it.
I understand your anguish, but look at the bright side. Your son took an interest in your phone.
treva23 said:
Hi Everyone.
I have a Samsung Galaxy S2
Kernal WXLP4 optus firmware.
I rooted the phone and stupidly let my son play with it and he has deleted important firmware apps such as Touch whiz and other things that are making my phone almost unusable.
Unfortunately there is no firmware repair on kies so i was wondering if anyone had any recommendations on what to do. I did a factory reset and it does not restore these important firmware files unfortunately.
Any help would be great.
Click to expand...
Click to collapse
Factory reset will restore will restore Touchwiz if not something else is going on that your son could not have done as its also damaged the hidden restore file .
Question as per rules = Q&A
jje
treva23 said:
Hi Everyone.
I have a Samsung Galaxy S2
Kernal WXLP4 optus firmware.
I rooted the phone and stupidly let my son play with it and he has deleted important firmware apps such as Touch whiz and other things that are making my phone almost unusable.
Unfortunately there is no firmware repair on kies so i was wondering if anyone had any recommendations on what to do. I did a factory reset and it does not restore these important firmware files unfortunately.
Any help would be great.
Click to expand...
Click to collapse
No problem. You will get it fixed in no time. Go to this thread and follow the instructions provided.
Download your firmware.
Put your phone in download mode
Flash it with Odin as PDA.
It will not increase your custom binary count and it will restore all the apps you are missing. If I were you I would just install XWLP7 on top of what you already have. It will not wipe anything and you will have the newest firmware installed.
Good luck!
Well, after installing the unstable JB 4.3 Vodafone Germany leak from http://forum.xda-developers.com/showthread.php?t=1835931, I've loaded my stock ROM I9300XXEMF6_I9300OJVEMF1_I9300XXEMA5 (4.1.2, Egypt) to PDA on Odin and flashed it. However the variants of Modem and CSC did not change from existing ROM with a change in IMEI.
How can I restore stock values for IMEI, Modem and CSC while I don't have Odin files for Phone (Modem) and CSC.
I9300XXEMF6
I9300OJVEMF1
I9300XXEMA5
Thanks!
Go read the stickies in general, in particular efs 'know this stuff'.
Basically you can't go back to anything earlier than EMGX baseband, flash anything later and your imei should be found again. Or you can restore the efs backup you made before flashing the 4.3
boomboomer said:
Go read the stickies in general, in particular efs 'know this stuff'.
Basically you can't go back to anything earlier than EMGX baseband, flash anything later and your imei should be found again. Or you can restore the efs backup you made before flashing the 4.3
Click to expand...
Click to collapse
So you suggest what to flash to restore the IMEI since I didn't backup EFS? Please refer any guide
Installed back leaked 4.3 ROM and could successfully restore the stock IMEI. I used kTool to backup efs as efs.bin. So I have to wait an official release for my country to be able to flash it without losing IMEI anymore.
the same here
ahmedmelm said:
Installed back leaked 4.3 ROM and could successfully restore the stock IMEI. I used kTool to backup efs as efs.bin. So I have to wait an official release for my country to be able to flash it without losing IMEI anymore.
Click to expand...
Click to collapse
iam facing the same problem
i could not find any way to solve this
i really can keep the rom 4.3 installed
but the phone is very slow
when i press any key to turn on display (not the phone) it can take from 3 to 6 seconeds to open
hope someone help
The stock kernel is very poor, try the liteGX kernel instead.
Same here.....but I've installed the IRISH 4.3 ......there's a silly wake up lag, too .....could I change the CSC to Egypt without root..... wishing that the Egyptian update roll out soooooooooooooooon.
Hi guys,
Can I perform downgrade simply by just restoring backup of 4.1.2, created with latest CWM?
Or do I need to do it via Odin?
I rather do it from backup to save my time on restoring phone with all apps and customisation...
Please could you advise?
Thank you
Yes, factory reset and format internal media before you restore. I did the exact same thing (back to 4.3) last night after trying 4.4 for an hour, too many things don't work in Kitkat.
Make sure your 4.1.2 was at least EMG4 or later to avoid efs problems.
Sent from my GT-I9300 using Tapatalk
bednim said:
Hi guys,
Can I perform downgrade simply by just restoring backup of 4.1.2, created with latest CWM?
Or do I need to do it via Odin?
I rather do it from backup to save my time on restoring phone with all apps and customisation...
Please could you advise?
Thank you
Click to expand...
Click to collapse
Backup is the easiest thing to restore from as it replaces everything on your current rom including the rom itself. BUT i wouldnt advise that as it may cause IMEI problems encountered when downgrading from 4.3 to lower due to the format of the efs being changed(which is modem related). Your phone would no longer receive calls etc.
Ive personally experienced this by flashing a 4.1.2 rom over a 4.3. As for a restore i am very sure it will not cause a problem but it can. In any case you can backup your efs partition by various programs and then restore by nandroid. If any problem occurs then restore your efs partition or upgrade to 4.3 again and flash MG4 modem.
thanks a lot for your responses guys!
I have formated cache and dalvik, formated data and system and hit restore afterwards.
Worked a treat!
Downgraded to EMC2. No problems with IMEI or phone calls.
Everything works fine.
Hello, I'm going to buy another Galaxy S2 as it is perfect phone form my persnal needs. No comments, no laughs, it's just me.
My current phone runs stock 2.3.6, but what I want is to get another one but with 4.1.2 to check if my setup on 2.3.6 let me get as much long battery life on 4.1.2.
I got CWM backup of my current 2.3.6 system and first thing I will do to new 4.1.2 is to make CWM backup, too.
I read that these systems are writetn in phone memory in a different way, something aboout different partitions, etc, you know. So my question is: can I transfer and restore CWM backup from one to another (I read about IMEI issues after restoring backup from another phone).
Another question is: if I flash 4.1.2 via ODIN to my current phone and I don't like, do I have to install 2.3.6 via ODIN then restore CWM 2.3.6 backup or can I restore CWMbackup over 4.1.2?
blackfire74 said:
Hello, I'm going to buy another Galaxy S2 as it is perfect phone form my persnal needs. No comments, no laughs, it's just me.
My current phone runs stock 2.3.6, but what I want is to get another one but with 4.1.2 to check if my setup on 2.3.6 let me get as much long battery life on 4.1.2.
I got CWM backup of my current 2.3.6 system and first thing I will do to new 4.1.2 is to make CWM backup, too.
I read that these systems are writetn in phone memory in a different way, something aboout different partitions, etc, you know. So my question is: can I transfer and restore CWM backup from one to another (I read about IMEI issues after restoring backup from another phone).
Another question is: if I flash 4.1.2 via ODIN to my current phone and I don't like, do I have to install 2.3.6 via ODIN then restore CWM 2.3.6 backup or can I restore CWMbackup over 4.1.2?
Click to expand...
Click to collapse
IMEI issues shouldn't be a problem if both phones are the same varient (i9100, etc). Just make sure that the recovery supports the backup file. In most cases, it should work. But beware, older recoveries may not fully support backups from newer recoveries. With your other question, it really doesn't matter how you restore android 2.3.6.