Related
I'm sure this has been asked many times before, but I just wanted to make absolutely sure I'm ready before I flash, so I don't brick my phone. I have been reading the forums for a few days now. I have an S3 (i747M) with Fido. I'm not totally sure which ROM to go with. From what I understand so far, I'm thinking StockMOD or Dandroid. I want a fairly minimalistic OS, latest version (4.3 vs 4.4?), so I can play the occasion game on it and get good idle battery life. I believe I have rooted my stock rom and I have disabled some of the bloat through the "Application Management" option under settings. Any advice on flashing? I have spent many years building, modding and generally tinkering with windows pcs but I haven't done anything with phones, android or linux. Any advice? Obviously do the backup of my current phone with the app mentioned on the related ROM installation page. I assume I can restore my phone back to this stock ROM is the new one fails? After the backup, do a full phone wipe and default restore. Then hook the phone to my PC via USB and use the related program to flash the phone? Thank you for any and all replies in advance. :good:
Kwijybow said:
I'm sure this has been asked many times before, but I just wanted to make absolutely sure I'm ready before I flash, so I don't brick my phone. I have been reading the forums for a few days now. I have an S3 (i747M) with Fido. I'm not totally sure which ROM to go with. From what I understand so far, I'm thinking StockMOD or Dandroid. I want a fairly minimalistic OS, latest version (4.3 vs 4.4?), so I can play the occasion game on it and get good idle battery life. I believe I have rooted my stock rom and I have disabled some of the bloat through the "Application Management" option under settings. Any advice on flashing? I have spent many years building, modding and generally tinkering with windows pcs but I haven't done anything with phones, android or linux. Any advice? Obviously do the backup of my current phone with the app mentioned on the related ROM installation page. I assume I can restore my phone back to this stock ROM is the new one fails? After the backup, do a full phone wipe and default restore. Then hook the phone to my PC via USB and use the related program to flash the phone? Thank you for any and all replies in advance. :good:
Click to expand...
Click to collapse
in my opinion or anyone will say that 4.3 is the most stable right now, and 4.4 is only available for CM based roms.....Samsung Touchwiz will always be the last to update their devices to 4.4 while custom roms AOKP, SLIM BEAM, PAC ROM, BEAN STALK, CM, PARANOID, ETC they will always have nightlies on latest the Android version but will take sometime for stable roms to be released
1st before you think of flashing please research and know what you're getting into
2nd read all the info. ROOT your i747m with cf-auto root (i recommend it cuz its the simplest, easiest, safest way to root)
3rd install custom recovery there are two that i know of but am confident and comfortable with clockworkmod recovery....u can try TWRP
4th yu can either wish to stay stock touchwiz, 2types of stock
-one that comes from samsung all bloated and no tweaks and
-the one that is taken by devs debloated, modded, customized, xposed mod, minimalistic, faster and better.
--OR you can go completely Android vanilla stock, which has nothing but the normal google staff (ITS LIKE A NEXUS DEVICE from Google) you dont have any bloatware, or features/addons just plain stock
5th Once yu know the basic, the universe is yours, with Android comes endless customization and possibilities just like Microsoft Windows, Linux, ubuntu or even OSX
6th wish to become a DEV its your choice, wish to modify, play with the filesystem its your choice but without knowledge of what you're doing bricking is easy as just deleting a file yu think its not important
7th help the rest with android as you do with PC
PS am learning to code now but one thing at a time so am starting with Web design, plan to learn some computer languages, hacking, etc computer science :laugh: maybe yu can help me out
everything you need to know about what i said or root http://forum.xda-developers.com/showthread.php?t=1725839
Thanks for the reply. It's been a while since I originally posted this. I decided to hold off on a custom ROM at that time but I find myself back again, still wanting to customize my phone (especially now that my contract is about to expire). I figure that if I do brick my phone beyond repair, I'll just get another phone anyways so not so worried about it now.
Anyways, one concern I have about flashing a custom ROM on my S3 is can I go backwards in Android versions? I can confirm that I am running the stock (Rogers / Fido) Android 4.4.2 which I believe is Kitkat? I am very interested in going either StockMOD or Dandroid, which as far as I can tell are 4.3 Jellybean? Can I do that?
Yes, you can run a 4.3 rom on your phone as long as you do not try to downgrade the bootloader.
You can go back to completely stock Rogers by using Odin to flash as stock kk rom from sammobile.com.
audit13 said:
Yes, you can run a 4.3 rom on your phone as long as you do not try to downgrade the bootloader.
You can go back to completely stock Rogers by using Odin to flash as stock kk rom from sammobile.com.
Click to expand...
Click to collapse
Thanks for the reply. Regarding the bootloader, the versions of Android I'm looking to install say they need the 4.3 bootloader. How can I check which bootloader I am running on my phone?
If you're phone is running stock Rogers kit kit, you have a kit kat bootloader which you can't downgrade.
If the rom needs a 4.3 bootloader and since you have a newer bootloader, you can probably load the rom.
Kwijybow said:
I'm not totally sure which ROM to go with.
Click to expand...
Click to collapse
Using the most recent build of the most popular ROM has it's advantages.
cm-12.1-20150807-NIGHTLY-d2att.zip
fast, light, stable, secure, supported
Hello folks.
I am new here and am not sure how it all works so please forgive me if I have posted in the wrong spot or am asking something that has been beaten to death already.
I have a AT&T GS3 I747 . I received the OTA 4.4.2 update for it and used it just fine. One day i got a bug in me to root and flash it. I rooted it, installed CWM 6.0.47 or something like that and installed Gummy Rom running kitKat 4.4.4.
I would love to return my phone to 4.4.2 with or without root. Is this possible? I have read and read to NOT take these backwards after JB 4.3
I have looked until I was blue in the face for a rom to use and am drawing blanks. I probably found one once and didnt know it. I can flash and all that and do it regularly, I just don't understand all the fancy lingo so I probably overlooked what I am looking for.
So bottom line, is it poissible for me to go back to stock 4.4.2? I would love a stock rom minus all the at&t bloatware since I will be unlocking it to straight talk.
Thanks for your time and once again, my apologies for dragging this all up again if it has been covered already.
First thing to do is update that custom recovery, or at least confirm you're on the latest version. I think that version you quoted is a little dated, and that has potential to cause you some problems flashing ROMs. An easy way to get and install the latest recovery is an app called Flashify.
Next have a look around the development section: http://forum.xda-developers.com/galaxy-s3-att/development
You'll find some debloated TW ROMs for that stock feel without the AT&T & Samsung junk along with plenty of other good ROMs to choose from.
It's wise of you to be cautious @DjPorkchop.
You are correct, you should never again downgrade your bootloader and modem, also called firmware and baseband. The very latest AT&T OTA updated bootloader and modem to NJ1, it is part of the 4.4.2 stock install. The OTA before that loaded NE4 bootloader and modem, they were also in a 4.4.2 stock rom, but you can not downgrade to them if you are on NJ1. AT&T has not issued an newer bootloader and modem than NJ1.
The good news is that the custom ROMs do not flash bootloaders and modems. You are safe to install even a 4.4.2 custom ROM on NJ1 firmware for this reason. There are stock system dumps available, with these you have to use caution because the bootloader and modem may be present, not always however. Talkingmonkeys has a TouchWiz based 4.4.2 ROM, TMS3KK, that is available in two versions, the second is heavily debloated. I am using the 4.3 Android version and will be soon updating to the heavily debloated 4.4.2 version. (He's still doing some minor theme tweaking on the newer version.)
How do I tell if I am on NJ1 or NE4? As I recall, I got the 4.4.2 update and all but immidiatly after had my phone shut off. I don't recall ever getting a 2nd update to 4.4.2 as long as my phone was active. I have been known to be wrong before though.
And I thank you much for the info. I will go check that thread out as soon as possible.
DjPorkchop said:
How do I tell if I am on NJ1 or NE4? As I recall, I got the 4.4.2 update and all but immidiatly after had my phone shut off. I don't recall ever getting a 2nd update to 4.4.2 as long as my phone was active. I have been known to be wrong before though.
And I thank you much for the info. I will go check that thread out as soon as possible.
Click to expand...
Click to collapse
There is a "Samsung Info" app in the PlayStore that will give you the info.
Or, in a terminal emulator you could enter:
Code:
getprop ro. bootloader
and
Code:
getprop | grep version.baseband
Thanks for letting me in on that app. It shows me on NE4.
So off I go to figure out what I am going to do to this phone. I am going to visit that thread you mentioned to me and see if I can make heads or tails of it and get a rom for this phone. I ike Gummy rom but it is a bit to much for me. I really want to get back to as close to stock as I can get safely without bricking my phone.
DjPorkchop said:
Thanks for letting me in on that app. It shows me on NE4.
So off I go to figure out what I am going to do to this phone. I am going to visit that thread you mentioned to me and see if I can make heads or tails of it and get a rom for this phone. I ike Gummy rom but it is a bit to much for me. I really want to get back to as close to stock as I can get safely without bricking my phone.
Click to expand...
Click to collapse
Ok so I revisited that page again and I can't make heads or tails of what to do. I know for certain I am on NE4. That is all I know. Any suggestions from that page to get me as close to stock as I can? I see there is a stock theme revert as well on that page.
Sorry to be such a pain. I am one of those guys that figured out how to root and flash and never should have.
Have a look here to return to stock: http://forum.xda-developers.com/galaxy-s3-att/general/ucuemjb-to-ucufne4-firmware-update-t2808654
DjPorkchop said:
Ok so I revisited that page again and I can't make heads or tails of what to do. I know for certain I am on NE4. That is all I know. Any suggestions from that page to get me as close to stock as I can? I see there is a stock theme revert as well on that page.
Sorry to be such a pain. I am one of those guys that figured out how to root and flash and never should have.
Click to expand...
Click to collapse
That room comes with a dark theme. The revert is not needed unless you want the lighter colored stock theme. I use the dark because, supposedly, a dark setup is a little easier on battery drain compared to light or white themes. I didn't install the extra battery mod, he had enough options built into the rom to suit me.
I'm really frustrated. I've been trying to update this Galaxy S3 for days now with no success. Currently I am running on Slimkat 7.0. It's sometimes slow and buggy and needs some updating.
For reference, this is the phone at its current state:
- Bootloader: i747ucalh9 (literally taken from the fail message when trying to update to any other bootloader)
- Modem/firmware (?): I747UCLH9
Here's what has happened, greatly summarized (note I'm using CM6.0.4.7 for all of these operations, and when I say "update", I mean "flash"):
- I tried updating to Slimkat 9 but received no signal. I gave up on it entirely for a while
- I tried installing various LP ROMs, including CM12.1.
- I had 12.1 running for a bit, but I had no connectivity. LTE, 3G,H+ nothing.
- I tried installing a newer modem (this thread. Finally at MJB, I could actually get connectivity in some of the newer ROMs (including Slimkat 9)... but it was very erratic. It would just randomly oscillate between LTE and 3G and H+. This also broke CM12.1 entirely.
- Again, the above problem was always present. Most of the LP ROMs would just bootloop me, though. The only one that worked was Cyanide L... which I didn't really like.
- I thought maybe the issue was the bootloader. My bootloader is still i747ucalh9. So I tried updating it to various bootloaders from here, but none of the updates will work. Literally, they give me error 6 or 7 and pretty much essentially tell me that I can't do it.
- So after repeating the cycle of "let me try to update this" several times and having the update fail on me, I'm still stuck at Slimkat 7 as the only thing that worked on LTE (note the past tense). Worse yet, I tried simply downgrading my modem to match my current bootloader version, but that made things worse than better. I am now stuck at 3G... which just recently went back to LTE. Talk about erratic.
- I also tried going full stock by flashing this: http://forum.xda-developers.com/showthread.php?t=2363882 But it expects 5 arguments for format, and got 3... or something. Failed hard.
So, I'm pretty much at the end of my rope here. I really might just go and grab a new phone at this point. I just really don't want to because this thing still works fine.... I guess I got unlucky and am at a version of the bootloader that is difficult to update from. I can't seem to go anywhere with this thing. Anyone have any ideas? Do I need to use a different recovery?
Thanks...
First and foremost, verify your bootloader. Install the Samsung phone info app, or in a terminal app or adb shell enter:
Code:
getprop ro.bootloader
If you're on any of the older bootloaders (the ones that do not end in MJB, NE4, or NJ1) there are two ways you can go (you probably will be given the age of your modem). If you're on any of the ones that end in MJB, NE4, or NJ1 you've got to be a lot more careful because downgrading them will hard brick your phone (Odin back to stock is not an option anymore).
Option 1: If you're on the older bootloaders, you can go to sammobile.com, grab the 4.1.1 firmware from there and flash it with Odin. Do not do this if your bootloader ends in MJB, NE4, or NJ1 (can't stress that enough). This will reset your phone completely to stock. You should now start getting OTA updates. They will be incremental updates, you'll have to take at least three or four to get up to date on bootloader and modem and they're big downloads. They will come every 24 hours, but you can cheat that by setting your system time forward 1 day to make them a little more rapid fire. This is a nice, safe way to get your firmware current. Once you're up to NJ1 firmware you can use Odin to flash a custom recovery and get back to custom ROMs; I'd recommend TWRP 2.8.6 if you're going to be flashing newer ROMs as CWM and Philz aren't as up to date and sometimes give problems with newer ROMs.
Option 2: I'm pretty sure your version of CWM is a big part of your problem. If you're going to be flashing lollipop you ought to update your recovery to TWRP 2.8.6; easiest way to get it is just use the Flashify app. I'd get that recovery up to date before messing with bootloaders too. Next get your firmware up to date. If your bootloader version is before MJB, then you have to start with MJB. Then update to NE4. Then update to NJ1. It has to be done incrementally, and the bootloader and modem must match on the newer firmwares, or you'll hard brick. This thread has recovery flashable MJB and NE4 bootloaders/modems; the bootloader and modem are packaged together in the same zip so you can't get out of sync. This thread has recovery flashable NJ1 bootloader/modem. This will get your firmware all up to date, and data should start behaving on newer kitkat and lollipop ROMs. This route is a lot more risky than the OTA route described above because of all the manual steps you have to take, but you could get it done quite a bit faster if you're confident in your abilities. Just read those linked threads very, very carefully and make certain you understand.
Good luck.
jason2678 said:
First and foremost, verify your bootloader. Install the Samsung phone info app, or in a terminal app or adb shell enter:
Code:
getprop ro.bootloader
If you're on any of the older bootloaders (the ones that do not end in MJB, NE4, or NJ1) there are two ways you can go (you probably will be given the age of your modem). If you're on any of the ones that end in MJB, NE4, or NJ1 you've got to be a lot more careful because downgrading them will hard brick your phone (Odin back to stock is not an option anymore).
Option 1: If you're on the older bootloaders, you can go to sammobile.com, grab the 4.1.1 firmware from there and flash it with Odin. Do not do this if your bootloader ends in MJB, NE4, or NJ1 (can't stress that enough). This will reset your phone completely to stock. You should now start getting OTA updates. They will be incremental updates, you'll have to take at least three or four to get up to date on bootloader and modem and they're big downloads. They will come every 24 hours, but you can cheat that by setting your system time forward 1 day to make them a little more rapid fire. This is a nice, safe way to get your firmware current. Once you're up to NJ1 firmware you can use Odin to flash a custom recovery and get back to custom ROMs; I'd recommend TWRP 2.8.6 if you're going to be flashing newer ROMs as CWM and Philz aren't as up to date and sometimes give problems with newer ROMs.
Option 2: I'm pretty sure your version of CWM is a big part of your problem. If you're going to be flashing lollipop you ought to update your recovery to TWRP 2.8.6; easiest way to get it is just use the Flashify app. I'd get that recovery up to date before messing with bootloaders too. Next get your firmware up to date. If your bootloader version is before MJB, then you have to start with MJB. Then update to NE4. Then update to NJ1. It has to be done incrementally, and the bootloader and modem must match on the newer firmwares, or you'll hard brick. This thread has recovery flashable MJB and NE4 bootloaders/modems; the bootloader and modem are packaged together in the same zip so you can't get out of sync. This thread has recovery flashable NJ1 bootloader/modem. This will get your firmware all up to date, and data should start behaving on newer kitkat and lollipop ROMs. This route is a lot more risky than the OTA route described above because of all the manual steps you have to take, but you could get it done quite a bit faster if you're confident in your abilities. Just read those linked threads very, very carefully and make certain you understand.
Good luck.
Click to expand...
Click to collapse
Thanks a lot for the help! I actually did/tried a majority of this an hour or two before you posted that, except the latest firmware update link you supplied. I knew it existed and I had seen that thread before, but I couldn't dig up the link again before I had to go to work. Thing is I kind of wanted to avoid Odin for some reason but I finally gave up and used it. And yeah I already knew my bootloader version. The phone told me when it failed to update the bootloader lol.
Here's what happened thus far:
- I used Odin to flash the sammobile 4.1.1. The flashing worked just fine, but booting into it did not. It hung on the Samsung logo. So, OTA updates were out the window.
- I have no idea why, so I just used Odin to flash TWRP onto it afterwards (from here)
- I tried one of the ROMS. Data still didn't work.
- I used the thread you linked to update to MJB bootloader and whatnot. The update went fine.
- Tried another few ROMs. Data worked, but LTE was still erratic.
- Updated to NE4 and then grabbed the deoxed stock ROM.
- The deoxed stock rom failed to boot (stuck at ATT globe logo). For some reason my phone can't use stock ROMs.
- So again used Odin to put TWRP onto the phone
- Installed various LP ROMS. Again the data was erratic and plus the battery life was horrid.
- Tried getting the ktoonsez kernel. My service was murdered.
- Gave up on LP. Tried Slim 9.0. Erratic data.
- Tried Liquidsmooth 4.4.4 instead.
Currently that's kind of where I'm at. The LTE data works fine (takes a bit to get up and running after reboot though) and thus far everything is okay (though that can quickly change considering I haven't done much of anything), so I don't even know if I want to mess with it anymore. It looks like this specific ROM includes a custom kernel. So I'm guessing it's an incompatibility between the kernel and the firmware version on the other ROMs. It seems like most of the LP roms have horrible battery life (back of my phone feels like a furnace on them), so I'm not even sure if I want to do that last firmware update to use them.
It'd be kind of nice to use the OTA but apparently my ability to go stock in any form or fashion is just totally borked.
Thanks for the post though, that's pretty gold. I'm sure someone in a situation like me where they have a super old firmware will find this thread of some use as it has actual instructions and links to what you need to do to get up and running. Before you posted that, I had to go digging around pretty much everywhere figuring out what and where was going wrong.
Glad you've got it mostly working.
You might have been able to get that stock ROM to boot if you had booted into the stock recovery and run a full wipe. Touchwiz ROMs can be tough to get running after being on AOSP. As a general progression try to format internal storage with TWRP (the wipe where you have to type "yes" to confirm), if that doesn't work try a wipe with Philz, and if that doesn't work nothing, not even Odin, is effective as a wipe in the stock recovery.
Thanks for typing all this out I believe it will help me put cm12.1 official on a friends phone.
Are these the steps?
1) verify latest software
2) twrp via Odin
Alt 2) root via apk then use rashr or similar to flash twrp
3)wipe
4)In twrp install official d2att from cm website
5) install current gapps
6) profit
I'm not new to this at all but I've never even touched an att gs3 and I know most devices have their quirks and I don't want to brick.
Also does towel root work on this? I don't mind Odin but I can do this on the fly I think if I can attain root.
Sent from my DROID RAZR M using XDA Free mobile app
mrkhigh said:
Thanks for typing all this out I believe it will help me put cm12.1 official on a friends phone.
Are these the steps?
1) verify latest software
2) twrp via Odin
Alt 2) root via apk then use rashr or similar to flash twrp
3)wipe
4)In twrp install official d2att from cm website
5) install current gapps
6) profit
I'm not new to this at all but I've never even touched an att gs3 and I know most devices have their quirks and I don't want to brick.
Also does towel root work on this? I don't mind Odin but I can do this on the fly I think if I can attain root.
Sent from my DROID RAZR M using XDA Free mobile app
Click to expand...
Click to collapse
Yep. You've got it. If you're on the latest and greatest firmware I think the towelroot exploit has been patched, unless geohot has retaken the lead in that arms race.
Easiest way to root on this phone since the bootloaders are unlocked is to just use Odin to flash a custom recovery then use the custom recovery to flash SuperSU. There's just a little trick to it. Store SuperSU.zip somewhere on your phone before flashing the custom recovery. Uncheck everything but f.reset time when you use Odin; don't let it auto reboot. Upon success pull battery. Replace battery and boot straight into recovery with vol up + home + power. If you mess up and boot into unrooted stock ROM with a custom recovery it will get overwritten with a stock recovery and you'll have to Odin custom recovery back onto it and try again.
I would do this to root your stock ROM just to execute this command in a terminal app or adb shell before any more serious flashing:
Code:
su
reboot nvbackup
That fixes a derp and gives you a working efs backup on a few backup partitions built into your phone instead of a blank one. Highly recommended before doing any ROM flashing. This will just look like a pretty normal reboot. You might see a quick flash of tiny blue text if you're watching for it.
Then you're ready to make a nandroid backup (just in case), wipe, and flash away. Take a look at LiquidSmooth if you're looking for a good lollipop ROM.
Nice... So the recovery partition gets rewritten every boot up until a custom ROM is installed and the efs can disappear... This is why you always ask questions.
Thanks for the suggestion on the ROM but I think I'll stick to official cm12.1 it's not my phone and that should be a nice readily updatable bland flavor of lollipop.
Sent from my DROID RAZR M using XDA Free mobile app
mrkhigh said:
Nice... So the recovery partition gets rewritten every boot up until a custom ROM is installed and the efs can disappear... This is why you always ask questions.
Click to expand...
Click to collapse
At the Android 4.3 update it was noticed that flashing a custom recovery would be overwritten by the stock recovery on the initial reboot unless following the method Jason described. Another solution was to delete two lib or .so files. On devices still on stock recovery, stock recovery does not overwrite itself.
There is a blank EFS partition on the device intended for a backup. The nvbackup command populates that partition with an image which will rebuild your EFS if it is lost during a modem update or ROM flash. The loss of EFS does happen. I believe wanam, of the xposed module fame, created an EFS backup tool for Samsung devices. I don't believe he updates it any longer because he rolled the functionality into a partition backup tool, the later is in the PlayStore listed under a different creator name, yet it's still him.
So I'm finally going to take the plunge, and update my boot loader/modem.. I never messed with it because all the Roms I used always worked.. I want to try lollipop, but due to old bootloader my phone won't boot with those Roms..
I'm on UCDLK3 bootloader/modem.. I know I have to upgrade to MJB, NE4, then NJ1 in that order in increments..
So my question: can I upgrade from LK3 straight to MJB with out any problems?? Or is there something I need to flash before I can get to MJB?? I think I can go straight to MJB, but better safe then sorry..
I know downgrading after upgrade most likely will brick.. Any information is appreciated... Oh, its an ATT I747..
coolwhipp420 said:
So I'm finally going to take the plunge, and update my boot loader/modem.. I never messed with it because all the Roms I used always worked.. I want to try lollipop, but due to old bootloader my phone won't boot with those Roms..
I'm on UCDLK3 bootloader/modem.. I know I have to upgrade to MJB, NE4, then NJ1 in that order in increments..
So my question: can I upgrade from LK3 straight to MJB with out any problems?? Or is there something I need to flash before I can get to MJB?? I think I can go straight to MJB, but better safe then sorry..
I know downgrading after upgrade most likely will brick.. Any information is appreciated... Oh, its an ATT I747..
Click to expand...
Click to collapse
Since you are on LK3 you may want to considr applying the free sim/carrier unlock method before upgrading; that is if you are on stock LK3 and you have not previously carrier unlocked your device.
There was an OTA release for the MG2 stock ROM, I believe that was 4.1.2. You may want to go to that before MJB. Did you make the nvbackup suggested by Jason?
Why would I do a carrier unlock, if I'm not switching carriers?? And if I do it, will I be able to use the same carrier?? Just seems like a waisted step for me.. But idk..
Jason's first post, option 2 is how I was planing to update.. And no, I haven't done the nvbackup yet.. How would I apply that backup if things go wrong? Not really sure what a nvbackup is..
Any information is appreciated..
coolwhipp420 said:
Why would I do a carrier unlock, if I'm not switching carriers?? And if I do it, will I be able to use the same carrier?? Just seems like a waisted step for me.. But idk..
Jason's first post, option 2 is how I was planing to update.. And no, I haven't done the nvbackup yet.. How would I apply that backup if things go wrong? Not really sure what a nvbackup is..
Any information is appreciated..
Click to expand...
Click to collapse
There is a command to manually trigger the restore routine. I think it's
Code:
reboot nvrestore
but don't hold me to that. I'd never execute that command except if in dire need. The problem with this phone is there is an automatic routine that can be triggered in the event of a bad flash that will overwrite your nvram with the backup, even if the backup is blank. I don't think the backup stores anything modem specific, but I've never been able to confirm that. So I've always done it again after updating modems (only had to once).
Having the phone sim unlocked can be nice if you plan on traveling internationally. Otherwise, potential future carrier hopping or added resale value are the only reasons to do it.
coolwhipp420 said:
Why would I do a carrier unlock, if I'm not switching carriers?? And if I do it, will I be able to use the same carrier?? Just seems like a waisted step for me.. But idk..
Jason's first post, option 2 is how I was planing to update.. And no, I haven't done the nvbackup yet.. How would I apply that backup if things go wrong? Not really sure what a nvbackup is..
Any information is appreciated..
Click to expand...
Click to collapse
If you will never be switching carriers, nor ever sell/give/trade the phone to someone who will switch, then it is an unecessary step to do the carrier unlock.
I see Jason beat me to answering both of your questions.
Hi,
I know this information is probably available somewhere, but I have spent hours of reading, and still having some trouble getting my head around things. So I will try to be clear here as to what my issues are.
Firstly... I have Samsung Galaxy S-III, SGH-i747M, with virgin mobile canada. It started with android 4.1.2. I wanted to unlock it, and there was a way to do it with 4.1.1 (http://forum.xda-developers.com/showthread.php?t=2176719), so I used odin, with firmwares (found at SamMobile.com I think) to flash a 4.1.1 ROM, did the unlock procedure, and then used odin to flash stock firmware for 4.1.2 again. Seems to have all worked out ok.
Anyway, I want to try some custom roms, like cyanogenmod, as they are purported to improve battery life, speed, clearing off bloatware, giving me more control, etc.
However, I really want to maintain the ability to go back to how it is now, if I don't like the custom roms. (or if I need warranty help, though there's not much of that left).
The main thing that's concerning me is that while I was playing with this phone before, I read in a number of places that if I had updated to Android 4.3 or 4.4.2 when those had become available from my carrier, I would not have been able to downgrade to 4.1.1 (which I needed to be able to do to use the built-in unlock method). This is because of Knox, which would be installed, and gets "tripped." So now I'm scared: if I did that upgrade, I wouldn't have been able to revert; so now, if I flash a CGM ROM, will I also be unable to revert?
I think there are a few pieces of android to sort out in my mind... If I'm not mistaken, there's bootloader, there's recovery, and there's the ROM. Flashing a ROM with Odin apparently would restore recovery and the ROM? But not the bootloader (that's where knox is? though I still don't understand, if an upgrade can modify the bootloader and put knox there, where it wasn't before, shouldn't there be a way to put a pre-knox version back there?)
Oh, there's also EFS, which some say should be backed up before doing anything (though you need to root first, which in my mind counts as doing something before backing it up).
Anyway, please let me know if you can help clarify these issues, thanks!!
There is a lot to cover to address all that you bring up.
Regarding EFS, there are a number of ways to back it up. Use several. This thread is an excellent place to start for more info and several ways to make the backup. I was rooted, so I used A2 and B. I believe you can use A1 without being rooted, probably B as well. Long after that post was written wanam came out with two backup apps available in the PlayStore. One was specifically for EFS, but I do not think it is still supported. The other is a more comprehensive app, both require root.
As a rule, bootloaders and modems are not installed with custom ROMs. If you are flashing a stock ROM from these forums that is installed from within a custom recovery it probably does not install a bootloader and modem either, but read the relevant thread to be certain. Full stock ROMs flashed from with Odin, or Heimdall, almost certainly install a bootloader and modem.
Prior to 4.3 there was an ability to downgrade bootloaders and modems, nor were they required to match - be at the same version. Once you upgrade to the official 4.3 bootloader you can no longer downgrade it. Once you have upgraded to 4.4.x the bootloader and modem versions must always match. If they are mismatched you risk soft bricking your phone at a minimum. For the i747 there was an unofficial 4.3 release; ROM, bootloader, and modem. I do not recall seeing mention of an unofficial release for the i747M, so I will not go into the exceptions on the above the unofficial bootloader/modem introduced.
For TouchWiz ROMs, custom or stock, the bootloader (and modem) version should match or be more current than the ROM Android version. (One of the unofficial 4.3 release exceptions applies here, I make use of it.)
For CyanogenMod, CM based ROMs, AOSP ROMs, and their derivatives the bootloader and modem version can lag behind Android version of the ROM. With your 4.1.2 bootloader and modem you could run the earlier releases of 4.4.x CM and AOSP ROMs. Later in the 4.4.x development, around Oct or Nov 2014 IIRC, I began reading reports of needing to be on 4.3 or later, there were a few said the 4.1.2 firmware still worked for them. For the 5.x.x LP releases of CM and AOSP most report that they must be on a 4.4.x bootloader and modem.
Knox is in the ROM, not the bootloader and modem. It was introduced with the official 4.3 releases. It is not present in CM/AOSP nor most of the custom TW ROMs. It will be present in stock ROMs from official sources or sites like sammobile. Many of the stock ROM images/dumps have Knox disabled, especially those from enewman17, but read to make sure what you are getting.
I don't feel qualified to discuss tripping the Knox counter, I am still on the unofficial 4.3 bootloader, which has not kept me from running 4.4.x ROMs. I am not the only Luddite, but I feel we will all be updating bootloaders and modems due to the Stage Fright bug. I am long out of warranty so there is no loss.
ABOVE ALL, read thoroughly before taking any action. Keep in mind that I am on the i747 and not the i747M as you are, I am not be correct on all comments for your device. @audit13 should be able to clear any gaffs I have made.
@dawgdoc is correct about everything said.
It is not Knox that prevents downgrading from 4.3 to an earlier version, it is the code in the bootloader itself.
Ok, starting to feel a bit more comfortable with the whole system and relationships, thanks!
audit13 said:
@dawgdoc is correct about everything said.
It is not Knox that prevents downgrading from 4.3 to an earlier version, it is the code in the bootloader itself.
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Click to collapse
Thanks for verifying that. There could have easily been small, but very important, differences in the devices that had slipped my mind since I don't have the i747M.
This is the way xda should be. Good questions from a concerned user & great answers from @dawgdoc. Nice job guys!
canodroid15 said:
This is the way xda should be. Good questions from a concerned user & great answers from @dawgdoc. Nice job guys!
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I would like to extend similar praise and thanks to @mrrocketdog and @audit13
more uncertainty
Hi,
I'm a lot more experienced now, having rooted (I flashed root66_BMC_I747MVLDMF1 by MrRobinson, since CF-autoroot just made the phone show "booting recovery" then blank screen indefinitely), I backed up EFS by a couple methods, flashed TWRP, did a nandroid backup, and flashed a couple versions of CM. Still a few things I want to clarify though.
Unsurprisingly, after flashing the final CM 11 release, data did not work, as I'm still on the 4.1.2 (MF1) bootloader/modem. In general, I see a lot of posts simply saying "update the modem." From what you've said though, that will create problems, unless I update the bootloader as well, correct? Just feels like the phrase "update the modem" is said so casually, without also mentioning the bootloader, and the inability to go back.
(an older CM 11 worked with data just fine)
(a big issue is that S3 is over 3 years old, so there are over 3 years of posts, so there's a lot of conflicting information, likely due to different versions, new discoveries, etc. )
I'm not quite sure myself what I'm trying to ask, I guess it's something along the lines of "am I just being silly by not updating?" There are a lot of "Never update to 4.3 (or above) because of knox!" comments. But also in general, it seems the only real issue with knox is that warranty bit, otherwise it doesn't have too big an impact on our lives? Seems the consensus is that we can still root, install custom roms, and everything else. (Do you know if this remains true with latest bootloaders and modems (OB3 for i747M). There are also "My battery life became way worse after the upgrade" or "more FCs" or other issues, which is a significant concern if my phone which currently comfortably lasts a day starts to not last a day after updating. Though it's likely a small percent noting that, while the quieter majority are fine. Meanwhile, by not updating, we may be missing out on features and security improvements (and maybe actually improved performance). What do you guys think? (I know dawgdoc was sticking to an unofficial 4.3 rather than updating, so it's not an obvious choice).
As for updating, I think somewhere one of you suggested the better (or at least safer) way is to use odin to flash stock ROM, then do the OTA updates, or, directly flash the latest stock ROM, rather than trying to flash modems and bootloaders directly?
Once I have a 4.3 or 4.4.2 bootloader/modem, I can delete any old TWRP nandroid backups from when I had 4.1.2 since restoring them would cause a brick? Same for EFS backup (which backed up EFS, Modem, Modemst1, and Modemst2 partitions)
Thanks again!
I almost wish I'd just taken the blue pill at the start of all this
For XDA members that are new to rooting, flashing, etc., I always recommend the safest route which is to flash back to a completely stock ROM and just upgrade to the latest bootloader and modem via OTA updates. There's always a risk of something going wrong when flashing anything, be it a custom ROM, recovery, or OTA update.
If the phone still had warranty, I recommend not flashing any non-Samsung software until the warranty has expired. Once expired, flash away
Knox should not interfere with root if supersu is flashed from a custom recovery, regardless of the bootloader. I have used supersu to root the latest s3, s4, Note2, and Note3 ROMs without a problem.
Restoring old nandroid backups should not cause a brick as TWRP does not change the modem or bootloader.
sacrawfo said:
....Still a few things I want to clarify though.
Unsurprisingly, after flashing the final CM 11 release, data did not work, as I'm still on the 4.1.2 (MF1) bootloader/modem.....
(an older CM 11 worked with data just fine)
I'm not quite sure myself what I'm trying to ask, I guess it's something along the lines of "am I just being silly by not updating?" ....(I know dawgdoc was sticking to an unofficial 4.3 rather than updating, so it's not an obvious choice).
Once I have a 4.3 or 4.4.2 bootloader/modem, I can delete any old TWRP nandroid backups from when I had 4.1.2 since restoring them would cause a brick? Same for EFS backup (which backed up EFS, Modem, Modemst1, and Modemst2 partitions)
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I think the change date for CM11 requiring the newer bootloaders, at least NE4, is Nov 2014. Releases prior to that date would run fine on older bootloaders.
I have since updated to NE4 in order to run ROMs patched with the StageFright fixes, specifically CM11 20150831. Knox isn't installed on this ROM or even the newer custom TouchWiz based ROMs. I am not concerned about Warranty Bit being triggered. My device is long past being covered by any warranty and I have no intentions of using Knox features on this phone in a corporate environment.
Keep the EFS backups, those are from partitions not changed by flashing roms; stock or otherwise.
Finally went through the OTA updates, surprised how long it took but all done, at OB3.
Ok makes sense, restoring an old Nandroid would effectively result in a 4.1.2 OS with a 4.4.2 bootloader/modem, which != brick.
Still surprised that modem updates do not effect the "modem" partition that EFS backup saved.
Thanks,
Restoring a nandroid backup should not brick the phone brick the phone as twrp does not restore the modem or bootloader.
sacrawfo said:
...
Still surprised that modem updates do not effect the "modem" partition that EFS backup saved.
Thanks,
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There are quite a few partitions not affected by flashing, not only the EFS partitions. IIRC there are secondary modem partitions, more than two extra bootloader partitions, etc.
So...
I got the tablet coming up on a year ago, and I rooted and installed TWRP immediately.
I'm currently running a stock ROM, and would like to continue to run stock based roms, but I've had issues with the custom kernel I'm running. The skyhigh thread is meager when it comes to details, but it also includes a few cryptic warnings about base and source and boot loader. Because I have no idea which one I'm running, or what to flash in TWRP, I'm in a terrible spot.
Searches, P.M.s and thread posts haven't gotten me anywhere.
Even if I could use Odin, the stock firmware thread, and the TW-Based ROM threads don't include the requirements, how you can test to see if you meet them, and if you don't, how you'd go about letting the requirements for base, etc.
Because of the introduction of threads like the stock firmware thread early on, root and odin methods used obscure FW, and now when selecting a few to download you have to choose between FW from France....from no country at all, or from the made up country of Us Cellular. So again, even if I wanted to broach the idea of Odin back to some semblance of stock, I couldn't.
But I ****desperately need a reflash/wipe/update***
Id like to run ironrom and kernel....
So how would I get there....from here? And preferably with TWRP?
Rooted 5.0.2 with TWRP and a really really old version of sky high.