Develop Bugs

no 4g signal now

I've been flashing roms and noticed my gps wouldn't work yesterday. flashed a couple other roms today and I can't get 4g signal, it just keeps saying H. should I be flashing a modem after each rom?
edit: I restored a stock backup I had before I started flashing roms and my 4g lte signal is back, no more H icon. what could be the problem? or solution?

What's your carrier?
Sent from my LG-E988 using XDA Premium 4 mobile app

bor3d2damax said:
What's your carrier?
Sent from my LG-E988 using XDA Premium 4 mobile app
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at&t

deadenz said:
at&t
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It's probably not the modem. CM/AOSP ROMs don't even flash modems. If you look, there are no basebands in the .zips. Not only that, but there's a growing body of evidence to suggest that modem/baseband flashing does not work at all via CWM/TWRP anyway.
Probably it's related to the RILJ.
The Open Source RILJ isn't as optimized as the stock one, and when you flashed back to stock, you got the stock RILJ. You baseband didn't change.

donalgodon said:
It's probably not the modem. CM/AOSP ROMs don't even flash modems. If you look, there are no basebands in the .zips. Not only that, but there's a growing body of evidence to suggest that modem/baseband flashing does not work at all via CWM/TWRP anyway.
Probably it's related to the RILJ.
The Open Source RILJ isn't as optimized as the stock one, and when you flashed back to stock, you got the stock RILJ. You baseband didn't change.
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so would that mean I should restore my stock backup and then flash the rom I want to install? does flashing rom after rom complicate things at all? or is there a way to completely start from scratch kinda like restoring the stock backup
this is on the instructions to flash cm 10.2 "Make sure you install this MODEM. Without it, you'll have a phone that never deep sleeps. ever." is this true with all roms or just cm 10.2?

You can go back to complete stock using the lg flash tool. But idk if it'll help.
@deadenz
Sent from my LG-E988 using XDA Premium 4 mobile app

deadenz said:
so would that mean I should restore my stock backup and then flash the rom I want to install? does flashing rom after rom complicate things at all? or is there a way to completely start from scratch kinda like restoring the stock backup
this is on the instructions to flash cm 10.2 "Make sure you install this MODEM. Without it, you'll have a phone that never deep sleeps. ever." is this true with all roms or just cm 10.2?
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That's for AT&T customers, and I think why it works is that it hooks into the part of the custom RILJ that is optimized for AT&T.
I'm not on AT&T and I've never had a problem with deep sleep, with or without flashing modems, and either way, the modem never actually changes.
I keep a clean stock CWM backup both on my PC and my internal storage on the device.
I frequently bounce between ROMs, but I always restore to stock before doing so.
There's a lot of strange behavior with sd cards, directories, etc. when doing so, however, because the recovery creates a mnt/storage directory that cannot be seen by the PC when running custom ROMs at all. You have to do an adb pull to backup from the directory. It's a PITA.

How do I go back to stock? Not stock modem.

Okay so I want to flash back to stock but I realized that my bootloader is not the stock one. I flashed the modem to the newest one before. My bootloader is I747MVLUEMK5. I've heard people sat that i cannot go back to stock just straight flashing with Odin now that I have a different modem. What procedures do I need to take to flash back to stock?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

karmasblade said:
Okay so I want to flash back to stock but I realized that my bootloader is not the stock one. I flashed the modem to the newest one before. My bootloader is I747MVLUEMK5. I've heard people sat that i cannot go back to stock just straight flashing with Odin now that I have a different modem. What procedures do I need to take to flash back to stock?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
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EDITED: This post was erroneous terrible advice. See latest post.

Alright, Im a bit perhaps... Noob at this? So I can just get the stock file and flash through Odin with no worries and no need to flash or do anything else? Thanks for the reply.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

karmasblade said:
Alright, Im a bit perhaps... Noob at this? So I can just get the stock file and flash through Odin with no worries and no need to flash or do anything else? Thanks for the reply.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
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I apologize. MK5 is a problematic bootloader. Do not try to Odin flash an older firmware over this. Again I apologize. What carrier are you with? If it is a Canadian carrier you can just flash the appropriate firmware from here: http://forum.xda-developers.com/showthread.php?t=2558311. These have the bootloader removed.

BCSC said:
I apologize. MK5 is a problematic bootloader. Do not try to Odin flash an older firmware over this. Again I apologize. What carrier are you with? If it is a Canadian carrier you can just flash the appropriate firmware from here: http://forum.xda-developers.com/showthread.php?t=2558311. These have the bootloader removed.
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Telus.

karmasblade said:
Telus.
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If you want absolute stock including the bootloader, modem, kernel, you can get an odin flashable firmware from here (This is the 4.3 version you are currently on, MK5) : http://forum.xda-developers.com/showthread.php?t=2543854. One of the members has started a seedbox to host the images because the download options in the OP are painfully slow. Post # 208 shows this link to the seedbox http://forum.xda-developers.com/showthread.php?t=2543854. You can pick the Telus ROM from here and use this for complete stock. Again I apologize for the bad advice. I've been stressing all day hoping you hadn't flashed 4.1.x yet.

BCSC said:
If you want absolute stock including the bootloader, modem, kernel, you can get an odin flashable firmware from here (This is the 4.3 version you are currently on, MK5) : http://forum.xda-developers.com/showthread.php?t=2543854. One of the members has started a seedbox to host the images because the download options in the OP are painfully slow. Post # 208 shows this link to the seedbox http://forum.xda-developers.com/showthread.php?t=2543854. You can pick the Telus ROM from here and use this for complete stock. Again I apologize for the bad advice. I've been stressing all day hoping you hadn't flashed 4.1.x yet.
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Alright. I already have a stock ROM before and the name of it includes MK5 for TLS. I'm thinking that would work? The exact name is "I747MVLUEMK5_I747MOYBEMK5_I747MVLUEMK5_HOME.tar.md5". No problem, good thing I didn't flash it LOL. Thanks for your help.

karmasblade said:
Alright. I already have a stock ROM before and the name of it includes MK5 for TLS. I'm thinking that would work? The exact name is "I747MVLUEMK5_I747MOYBEMK5_I747MVLUEMK5_HOME.tar.md5". No problem, good thing I didn't flash it LOL. Thanks for your help.
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That is the correct one, Backup everything you need off your phone as Odin will wipe everything. nLeaving an external SD in is OK, but the internal memory will get wiped.

BCSC said:
That is the correct one, Backup everything you need off your phone as Odin will wipe everything. nLeaving an external SD in is OK, but the internal memory will get wiped.
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Alright. I was on Quantum but I find that the newest version is far too glitchy and incomplete for me. Any other ones you recommend? How about LiquidSmooth?

karmasblade said:
Alright. I was on Quantum but I find that the newest version is far too glitchy and incomplete for me. Any other ones you recommend? How about LiquidSmooth?
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Click to collapse
I've only used stock and CM11 so far since 4.3. The I've not tried Liquid Smooth but Grievous ROM is pretty good. It's the ROM currently on my wife's phone. It is white themed Touchwiz which was my biggest selling point.

BCSC said:
I've only used stock and CM11 so far since 4.3. The I've not tried Liquid Smooth but Grievous ROM is pretty good. It's the ROM currently on my wife's phone. It is white themed Touchwiz which was my biggest selling point.
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I don't think that is compatible with the i747m no?
Oh and also, let's say I want to get Liquid Smooth onto my phone but I currently have Quantum. Do I have to flash back to stock with Odin and then install the Liquid Smooth ROM? Or can I just go and wipe the system now in recovery without going to stock and then install Liquid Smooth in recovery?

Grievous is compatible with the 747m. Im on 747m Bell. You just need to flash a modem and kernel to get data and wifi to work. As far as liquid smooth, you do not need to go back to stock. Installing the ROM and then wiping should work. If you do find that you ever flash a ROM and have WiFi issues, kernel is likely culprit. No data is usually due to a modem. These seem to be more often with new ROMs and most development based off AT&T phones.

Most popular touchwiz based rom?

I like the touchwiz UI but i want the added enhancements of custom firmware, i know ill probably get flamed with people saying "search
for asking this, but can you guys recommend a custom touchwiz rom? preferably the most popular/up to date

DN3 if you want a 4.3 Rom
Tweaked if you want a 4.1.2 Rom

Double0EK said:
DN3 if you want a 4.3 Rom
Tweaked if you want a 4.1.2 Rom
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So DN3 looks great but its a N7105 rom, which apparantly is fine, except that it insists that i flash one of 3 modem options, none of which are for my phone. also i heard that for my phone (t889v), once you flash a modem for the wrong device you cant get the correct modem back again.

The T889v doesnt have a flashable modem available?

nodyarg said:
So DN3 looks great but its a N7105 rom, which apparantly is fine, except that it insists that i flash one of 3 modem options, none of which are for my phone. also i heard that for my phone (t889v), once you flash a modem for the wrong device you cant get the correct modem back again.
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Click to collapse
I would take the dn3 zip and take out the n7105 modem files and replace them with t889v modem files.
Sent from my SAMSUNG-SGH-I317 using XDA Premium 4 mobile app

cnote74 said:
I would take the dn3 zip and take out the n7105 modem files and replace them with t889v modem files.
Sent from my SAMSUNG-SGH-I317 using XDA Premium 4 mobile app
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I tried that by replacing the modem.bin files in the rom's folders for the 3 modem versions with the wind 4.3 modem.bin, it took 2 flashes before my phone would start working but still had a no network symbol instead of signal bars. i also tried flashing the wind 4.1.1 modem through recovery after but no luck. i can see that others on the t889 have had success with this rom, so i should be able to use it on a t889v, cant figure out what the problem is.

nodyarg said:
I tried that by replacing the modem.bin files in the rom's folders for the 3 modem versions with the wind 4.3 modem.bin, it took 2 flashes before my phone would start working but still had a no network symbol instead of signal bars. i also tried flashing the wind 4.1.1 modem through recovery after but no luck. i can see that others on the t889 have had success with this rom, so i should be able to use it on a t889v, cant figure out what the problem is.
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Once the 889V gets the wrong devices modem you will have a tough time getting it out from what I have seen.
Hastily spouted for your befuddlement

Coug76 said:
Once the 889V gets the wrong devices modem you will have a tough time getting it out from what I have seen.
Hastily spouted for your befuddlement
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I got it working by wiping basically everything except external sd, and incidentally soft bricking my phone, then going into download mode and using odin to flash a factory rom. got signal bars back, so then i reflashed custom recovery and tried flashing dn3 with a new modem again but im not having any luck with it.

nodyarg said:
I got it working by wiping basically everything except external sd, and incidentally soft bricking my phone, then going into download mode and using odin to flash a factory rom. got signal bars back, so then i reflashed custom recovery and tried flashing dn3 with a new modem again but im not having any luck with it.
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Not having luck with data? Have you set your APNs? Check the obvious stuff first.

Double0EK said:
Not having luck with data? Have you set your APNs? Check the obvious stuff first.
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Click to collapse
Its not data. Its just plain network signal. Instead of seeing bars at the top right ive got a no smoking sign without the cigarette in the middle. Thats what i meant by "no network" symbol. Im pretty sure that its a modem issue. Strange taht flashing a modem over it wonrt work, and other than that the rom works perfectly, but not being able to use my phone to make calls is kind of a dealbreaker.

Most popular will be those listed on the first page of development
Thanks
FNSM

[Q] GPS does not work

Hello
I have SGH-M919. First, it had stock ROM, stock firmware, and it was SIM locked to T-Mobile, so I unlocked it with SRS server service (I live outside the US, so labs in my area didn't have the tools to unlock it, since it's only a US variant. Also, other methods of unlocking did not work for me, unfortunately).
In the unlocking process I had to flash custom modem file with Odin (it was required for SRS to work). After that, I flashed CWM and CM11 and everything worked fine except the GPS. It didn't work: no GPS satellites were found.
How can I resolve this issue? Thanks.

Go to the CyanogenMob forum. There are threads asking the same question regarding CM11
Sent from my SGH-M919 using XDA Premium 4 mobile app

Kriptik210 said:
Go to the CyanogenMob forum. There are threads asking the same question regarding CM11
Sent from my SGH-M919 using XDA Premium 4 mobile app
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I will try there, thanks. Although I have to mention that I think that's the problem isn't with CM but the modem file/kernel/etc

matan129 said:
I will try there, thanks. Although I have to mention that I think that's the problem isn't with CM but the modem file/kernel/etc
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If it might be the modem or kernel then you can try re flashing the modem or trying a new kernel. You'll see a lot of GPS issues being asked about in the CM threads, tho.
Sent from my SGH-M919 using XDA Premium 4 mobile app

Kriptik210 said:
If it might be the modem or kernel then you can try re flashing the modem or trying a new kernel. You'll see a lot of GPS issues being asked about in the CM threads, tho.
Sent from my SGH-M919 using XDA Premium 4 mobile app
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Can you link me to some alternative kernels / modems? I can't find any.

matan129 said:
Can you link me to some alternative kernels / modems? I can't find any.
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Just flash the stock modem since you said it was modified, unless its still needed.. However, many users have lost GPS after flashing aosp/cm.. The fix is simple. First make a nandroid backup, flash a touchwiz ROM, get a GPS lock, and then restore your nandroid.

serio22 said:
Just flash the stock modem since you said it was modified, unless its still needed.. However, many users have lost GPS after flashing aosp/cm.. The fix is simple. First make a nandroid backup, flash a touchwiz ROM, get a GPS lock, and then restore your nandroid.
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Click to collapse
Sorry, forgot to mention that I already tried flashing stock rom but GPS didn't work (it did work before the unlocking), so it has to be a modem problem. I couldn't find a stock modem file anywhere.
Currently I'm downloading another stock ROM, so I will be able to bring up lbstestmode which might fix my issue.
EDIT:
The new stock ROM works fine, and the GPS was able to find signal. So, I as ou suggested and recovered the Nandroid I made before through the recovery, but now I can't find GPS again. What can I do?

NB4 modem is posted in the general section

serio22 said:
Just flash the stock modem since you said it was modified, unless its still needed.. However, many users have lost GPS after flashing aosp/cm.. The fix is simple. First make a nandroid backup, flash a touchwiz ROM, get a GPS lock, and then restore your nandroid.
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Click to collapse
Is this a permanent fix for GPS?
Sent from my SGH-M919 using XDA Premium 4 mobile app

I have searched for stock modem and found this.
Unfortunately, I do have a KNOX counter in download mode so it doesn't fit.
This guide links to another modem file (that works with the KNOX bootloader), but it is for MK2, and I need BN4.. What can I do?
EDIT:
The issue is FIXED! The GPS works perfectly! Ultimately, I did install the MK2 modem and although I have 4.4.2 BN4 it works just fine.
Thanks for everyone who helped me.

Kriptik210 said:
Is this a permanent fix for GPS?
Sent from my SGH-M919 using XDA Premium 4 mobile app
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Not sure, I almost never go aosp/cm
matan129 said:
I have searched for stock modem and found this.
Unfortunately, I do have a KNOX counter in download mode so it doesn't fit.
This guide links to another modem file (that works with the KNOX bootloader), but it is for MK2, and I need BN4.. What can I do?
EDIT:
The issue is FIXED! The GPS works perfectly! Ultimately, I did install the MK2 modem and although I have 4.4.2 BN4 it works just fine.
Thanks for everyone who helped me.
Click to expand...
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Good! If you experience any issues you could flash the full NB4 firmware as well

serio22 said:
Good! If you experience any issues you could flash the full NB4 firmware as well
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I don't think I should, I have a bootloader with Knox (it was stated that it's only good for 4.2.2 bootloaders - ones without Knox. That's why I installed the MK2.

matan129 said:
I don't think I should, I have a bootloader with Knox (it was stated that it's only good for 4.2.2 bootloaders - ones without Knox. That's why I installed the MK2.
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I'm not talking about the modem, but firmware, it will flash the modem in the process and you can flash it with your bootloader.. Like I said, if you experience problems but so far you haven't seemed to

serio22 said:
I'm not talking about the modem, but firmware, it will flash the modem in the process and you can flash it with your bootloader.. Like I said, if you experience problems but so far you haven't seemed to
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Before I flashed the correct modem files, I flashed the latest stock firmware from Sammobile which I believe contains the NB4 modem. The GPS still didn't work, only the Mk2 modem works for me
Sent from my SGH-M919 using XDA Premium 4 mobile app

matan129 said:
Before I flashed the correct modem files, I flashed the latest stock firmware from Sammobile which I believe contains the NB4 modem. The GPS still didn't work, only the Mk2 modem works for me
Sent from my SGH-M919 using XDA Premium 4 mobile app
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That firmware is buggy, fenny's NB4 firmware is the one you want

serio22 said:
That firmware is buggy, fenny's NB4 firmware is the one you want
Click to expand...
Click to collapse
Still, the MK2 firmware just works better for me.
Also, if I can't flash the fixed NB4 firmware because the bootloader has Knox, how will it help me if I install the non-fixed version (which is included in the firmware)? I'd be stuck with the bad NB4! There's no way to install the fixed NB4 if I have bootloader with Knox, if I understand this whole thing correctly.
P.S I am not intending to argue or anything, I am just writing what happened to me. So, if someone has the same problem and he googles it he will be able to find some useful info that took me about 2 days to find (and your generous help in this thread, of course!

matan129 said:
Still, the MK2 firmware just works better for me.
Also, if I can't flash the fixed NB4 firmware because the bootloader has Knox, how will it help me if I install the non-fixed version (which is included in the firmware)? I'd be stuck with the bad NB4! There's no way to install the fixed NB4 if I have bootloader with Knox, if I understand this whole thing correctly.
P.S I am not intending to argue or anything, I am just writing what happened to me. So, if someone has the same problem and he googles it he will be able to find some useful info that took me about 2 days to find (and your generous help in this thread, of course!
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The firmware will flash with your bootloader.. anyway everything is working for you so there is no need to. If in the future you change your mind or have problems PM me and I will explain or help you with it

serio22 said:
The firmware will flash with your bootloader.. anyway everything is working for you so there is no need to. If in the future you change your mind or have problems PM me and I will explain or help you with it
Click to expand...
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Alright, thanks you very much for your help!

serio22 said:
Not sure, I almost never go aosp/cm
Click to expand...
Click to collapse
Same here
Sent from my SGH-M919 using XDA Premium 4 mobile app

I noticed that I was getting bad cellular reception in an area that should have full mobile coverage. So I flashed the 4.4.2 fixed BN4 modem and the reception is way better (from one bar to 3 or 4), and the GPS is still working.
So, the BN4 modem did flash although I have bootloader with Knox (so it isn't supposed to work according the the modem thread)
P.S. I'm quite confused. Sorry for the noob question, but what's the difference between ROM and firmware? Is the firmware just a package which includes the ROM, bootloader and modem?

[Q] T-Mobile Modem Question

I have a rooted S4 running GPE 5.0.1. Since updating about 2 weeks ago it seems my signal strength isn't as strong as it was with my old ROM (CarbonRom 4.4.4) and I'm experiencing complete signal dropouts from time to time.
This got me thinking about my modem. Does it need to be updated? WiFi is working fine. My last official OTA was from T-Mobile about a year ago when they took the phone to 4.2.2. My baseband is M919UVUAMDL and poking around various XDA sees forum threads discussing "NK2" and "NK4" modems. Tmo's website lists M919UVUFNK2 as the latest baseband so my modem is out of date? I looked for a Tmo version of the just "NK2" modem and didn't find anything that wasn't a full ROM install. Just want to update my modem and keep Lollipop 5.0.X Is there a modem update I should flash?
Any thoughts and help would be appreciated.

Ghoster013 said:
I have a rooted S4 running GPE 5.0.1. Since updating about 2 weeks ago it seems my signal strength isn't as strong as it was with my old ROM (CarbonRom 4.4.4) and I'm experiencing complete signal dropouts from time to time.
This got me thinking about my modem. Does it need to be updated? WiFi is working fine. My last official OTA was from T-Mobile about a year ago when they took the phone to 4.2.2. My baseband is M919UVUAMDL and poking around various XDA sees forum threads discussing "NK2" and "NK4" modems. Tmo's website lists M919UVUFNK2 as the latest baseband so my modem is out of date? I looked for a Tmo version of the just "NK2" modem and didn't find anything that wasn't a full ROM install. Just want to update my modem and keep Lollipop 5.0.X Is there a modem update I should flash?
Any thoughts and help would be appreciated.
Click to expand...
Click to collapse
At the moment I have not seen a flashable zip for nk2, Im on official cm12 android 5.0.2 and just updated my modem, here is what I did, I download the full firmware , extracted it with winrar, and used Odin 3.0.7 to flash the modem.bin and non-hlos.bin
Sent from my SGH-M919 using XDA Free mobile app

Correct me if something has changed; but doesn't flashing an up to date non-hlos still randomly cause complete signal drop on devices that are not running the updated bootloader that came with 4.4?
Or rather; at least until securestorage is disabled in build.prop
Also, you will most likely have to flash them 2x with odin.
First time uncheck the auto restart box, and manually power cycle back into download mode.
Second time leave the auto restart checked.

gurnted said:
Correct me if something has changed; but doesn't flashing an up to date non-hlos still randomly cause complete signal drop on devices that are not running the updated bootloader that came with 4.4?
Or rather; at least until securestorage is disabled in build.prop
Also, you will most likely have to flash them 2x with odin.
First time uncheck the auto restart box, and manually power cycle back into download mode.
Second time leave the auto restart checked.
Click to expand...
Click to collapse
So perhaps it would be better to odin the lastest official t-mobile ROM back onto the phone to update all the internals and the bootloader etc, then root again and re-install my preferred custom ROM of choice?

dpwguenther said:
At the moment I have not seen a flashable zip for nk2, Im on official cm12 android 5.0.2 and just updated my modem, here is what I did, I download the full firmware , extracted it with winrar, and used Odin 3.0.7 to flash the modem.bin and non-hlos.bin
Sent from my SGH-M919 using XDA Free mobile app
Click to expand...
Click to collapse
You should only flash NON-HLOS is you have the same bootloader as the NON-HLOS you are flashing
Ghoster013 said:
So perhaps it would be better to odin the lastest official t-mobile ROM back onto the phone to update all the internals and the bootloader etc, then root again and re-install my preferred custom ROM of choice?
Click to expand...
Click to collapse
That would be the best option, but if you decide to only flash the modem, only flash modem.bin

serio22 said:
You should only flash NON-HLOS is you have the same bootloader as the NON-HLOS you are flashing
That would be the best option, but if you decide to only flash the modem, only flash modem.bin
Click to expand...
Click to collapse
I flashes the non-hlos.bin on a different bootloader with no issues at all, that's the only reason why I suggested it
Sent from my SGH-M919 using XDA Free mobile app

dpwguenther said:
At the moment I have not seen a flashable zip for nk2, Im on official cm12 android 5.0.2 and just updated my modem, here is what I did, I download the full firmware , extracted it with winrar, and used Odin 3.0.7 to flash the modem.bin and non-hlos.bin
Sent from my SGH-M919 using XDA Free mobile app
Click to expand...
Click to collapse
Why does it matter which version of Odin we have to use? Specifically, why Odin 3.07?
Additionally, if modem.bin refers to the modem for the Samsung Galaxy S4 then what does non-hlos.bin refer to?

XDAUserWork said:
Why does it matter which version of Odin we have to use? Specifically, why Odin 3.07?
Additionally, if modem.bin refers to the modem for the Samsung Galaxy S4 then what does non-hlos.bin refer to?
Click to expand...
Click to collapse
Well, I say use v3.0.7 because that is the version that worked for me, your results may vary, also some say that the non-hlos.bin refers to a separate modem for lte only, others say it refers to the WiFi driver, now, you don't have to flash it of you feel it has no benefit to you, I only did because this phone is the first one I've used that has the non-hlos.bin,, so I flashed it.
Sent from my SGH-M919 using XDA Free mobile app

dpwguenther said:
Well, I say use v3.0.7 because that is the version that worked for me, your results may vary, also some say that the non-hlos.bin refers to a separate modem for lte only, others say it refers to the WiFi driver, now, you don't have to flash it of you feel it has no benefit to you, I only did because this phone is the first one I've used that has the non-hlos.bin,, so I flashed it.
Sent from my SGH-M919 using XDA Free mobile app
Click to expand...
Click to collapse
Since it is possible to flash the modem (via modem.bin) as well as flashing the lte modem/or WiFi driver (via non-hlos.bin) - then is it also possible to flash the bootloader itself on the Samsung Galaxy S4 (SGH-M919) if it is running Android 4.4.4 (M919UVUFNK2)? If so, how would someone accomplish doing this?

XDAUserWork said:
Since it is possible to flash the modem (via modem.bin) as well as flashing the lte modem/or WiFi driver (via non-hlos.bin) - then is it also possible to flash the bootloader itself on the Samsung Galaxy S4 (SGH-M919) if it is running Android 4.4.4 (M919UVUFNK2)? If so, how would someone accomplish doing this?
Click to expand...
Click to collapse
I'm pretty sure I can make a flashable zip for you, but in all honesty, I wouldn't recommend doing that, to reduce the risk of a brick and to keep money in your pocket, I would do a full backup and flash the latest stock update to update the bootloader
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dpwguenther said:
I'm pretty sure I can make a flashable zip for you, but in all honesty, I wouldn't recommend doing that, to reduce the risk of a brick and to keep money in your pocket, I would do a full backup and flash the latest stock update to update the bootloader
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Let me ask this: if it's possible to make a flashable zip to flash the bootloader to a higher version (like the bootloader from Android 4.4.4-M919UVUFNK2) then is it also possible to make a flashable zip to flash the bootloader to a lower version (like the bootloader from Android 4.2.2.-M919UVUAMDL)?

I believe I'm in the same boat. I tried out AICP ROM 5.0.2 and my signal dropped out most of the entire time and I could rarely send or receive calls/texts when it showed that I had signal. I now have restored my backup of AICP 4.4.4 and so far it seems to be working correctly. But a flashable zip would be highly appreciated if someone could do it. I would try myself but internet is extremely slow and I'm afraid I would make a mistake and brick phones other than mine.

XDAUserWork said:
Let me ask this: if it's possible to make a flashable zip to flash the bootloader to a higher version (like the bootloader from Android 4.4.4-M919UVUFNK2) then is it also possible to make a flashable zip to flash the bootloader to a lower version (like the bootloader from Android 4.2.2.-M919UVUAMDL)?
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As I remember it from my GS3 days, once a Knox bootloader is implemented (I.e 4.3+) you can not downgrade to a non Knox bootloader (I.e 4.2-)
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---------- Post added at 01:30 PM ---------- Previous post was at 01:24 PM ----------
Ive also been doing some research on the flashable zip for bootloader, and it seems very difficult for me to make one