hi,
have SM-G901 samsung galaxy s5 plus, android is 4.4.4, baseband: G901FXXUANK2, on EE in uk, i believe the rom i need kccat6
I have manage to root and disable knox.
anybody ? i need help to install custom rom can i flash different firmware and use a different rom ?
Yes. You can, just make sure to do a full wipe before flashing the new firmware. What's your provider and is your bootloader unlocked?
hi provider is uk ee, have rooted mobile, how do i check bootloader status, i flashed using cf-root with odin to get root and supersu installed, have managed to disable knox as well from supersu.
i am registered with sammobile just need some guidance on getting correct firmware so i do not brick mobile.
sajeel said:
hi provider is uk ee, have rooted mobile, how do i check bootloader status, i flashed using cf-root with odin to get root and supersu installed, have managed to disable knox as well from supersu.
i am registered with sammobile just need some guidance on getting correct firmware so i do not brick mobile.
Click to expand...
Click to collapse
i think you ask in the wrong section, go to Q&A.
When you flash different firmware, make sure you use the correct modem and bl , or it wont boot and give bad reception.
look at picture , i believe the correct one
you have been thanked yes that is correct will move to q & a.
Related
Hey all!
Is it possible to downgrade from a newer (NE3) firmware to an older (ND3) through Odin or it will brick my phone because of the bootloader?
The only things I know are that 1) Downgrade from 4.4.2 to 4.3 is not possible 2) It's possibile to install a custom older rom on new bootloader and vice versa BUT I don't know if it's possible with stock roms with Odin.
I looked for a solution but nothing found and no one answered me so I opened this thread to find out a solution.
Thanks in advance.
UP still interested because NE4 + custom kernel gives problems that others doesn't have
Sent from my SM-N9005 using XDA Premium 4 mobile app
Dan
I also wanted to do dawngrade because the because the 4.4.2 is **** battery does not hold as it should as was holding before the update
kylothow said:
Hey all!
Is it possible to downgrade from a newer (NE3) firmware to an older (ND3) through Odin or it will brick my phone because of the bootloader?
The only things I know are that 1) Downgrade from 4.4.2 to 4.3 is not possible 2) It's possibile to install a custom older rom on new bootloader and vice versa BUT I don't know if it's possible with stock roms with Odin.
I looked for a solution but nothing found and no one answered me so I opened this thread to find out a solution.
Thanks in advance.
Click to expand...
Click to collapse
I never actually tried going back to an older version but I really don't see why you shouldn't. As long as it's KitKat 4.4.2 just try it should work. I downgraded my Modem and haven't had any issue.
With the Bootloader worry...did you even change the bootloader? As well as the Modem you have to do that separate to the Rom, as flashing a Rom doesn't touch Modem an Bootloader!!! If you don't know how to do that please just leave it alone though unless you read, read, read a lot on how to do that.
4aces said:
I never actually tried going back to an older version but I really don't see why you shouldn't. As long as it's KitKat 4.4.2 just try it should work. I downgraded my Modem and haven't had any issue.
With the Bootloader worry...did you even change the bootloader? As well as the Modem you have to do that separate to the Rom, as flashing a Rom doesn't touch Modem an Bootloader!!! If you don't know how to do that please just leave it alone though unless you read, read, read a lot on how to do that.
Click to expand...
Click to collapse
Thanks for the reply, every time I install a new rom I make sure to update the bootloader and modem too, and from what I can read from the Synapse app I have the NE3 modem and NE4 bootloader.
I'm asking how to go back to older roms because going from 4.4.2 to 4.3 updating the bootloader with Odin you obtain only a fancy paper weight, and I didn't know if going from newer to older 4.4.2 bootloader it was the same story.
Sent from my SM-N9005 using XDA Premium 4 mobile app
kylothow said:
Thanks for the reply, every time I install a new rom I make sure to update the bootloader and modem too, and from what I can read from the Synapse app I have the NE3 modem and NE4 bootloader.
I'm asking how to go back to older roms because going from 4.4.2 to 4.3 updating the bootloader with Odin you obtain only a fancy paper weight, and I didn't know if going from newer to older 4.4.2 bootloader it was the same story.
Sent from my SM-N9005 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I'm pretty sure there won't be an issue mate since I flash between custom roms almost daily which are most of the time different models. If you want to be 100% sure wait for someone to confirm as I'm rooted since I got the chance to do so.
Thanks to the developer Civato I read on his FlexKat thread he correctly downgraded his bootloader from NE6 to ND6 with Odin...
So problem solved, this is definitely possible.
Thank you everyone for your replies :good:
Downgrading bootloaders on the same version generally tends to work OK, mainly because on 4.3 Samsung patched the security flaw which stopped you going <MJ7
Kith Kitkat I never had any issues flipping back and forth.--- Until it's a BL upgrade with OS Number change (IE: 4.4.3 if it has new BL) then it shouldn't work.
hi. sorry,this is probably an old thread but I need some help,please and somehow,Google got me here. I want to downgrade (not really downgrade) my N9005 to 4.4.2.
I currently have a custom ROM(resurrection remix v5.6.9,in settings it says that I have android 6.0.1 marshmallow). Also,I have a custom recovery(TWRP). Well,I would like to install the KitKat stock ROM and really did a lot of research but I cannot find it anywhere :'( . Do you know any source? And also,can I flash it with mobile ODIN? When I opened Mobile Odin Pro it said that if I don't have the boot loader for the ROM I want to install then I will experience a soft brick. Isn't TWRP a good boot loader?
Also,does it matter what version of N9005 I own? mine is: XXUGBOJ1. Could I flash smth that is not for this ..base band is it called?...
pls help
I'm such a newbie and I don't wanna mess up
PainCutter said:
hi. sorry,this is probably an old thread but I need some help,please and somehow,Google got me here. I want to downgrade (not really downgrade) my N9005 to 4.4.2.
I currently have a custom ROM(resurrection remix v5.6.9,in settings it says that I have android 6.0.1 marshmallow). Also,I have a custom recovery(TWRP). Well,I would like to install the KitKat stock ROM and really did a lot of research but I cannot find it anywhere :'( . Do you know any source? And also,can I flash it with mobile ODIN? When I opened Mobile Odin Pro it said that if I don't have the boot loader for the ROM I want to install then I will experience a soft brick. Isn't TWRP a good boot loader?
Also,does it matter what version of N9005 I own? mine is: XXUGBOJ1. Could I flash smth that is not for this ..base band is it called?...
pls help
I'm such a newbie and I don't wanna mess up
Click to expand...
Click to collapse
Get a 4.4.2 fw and flash with windows odin. Not really familiar with mobile odin. Find fw for you country csc. Flashing other csc fw sometimes requires pit file so better get the 1 for your country or originally came with the phone.
Sent from my SM-N920C
Rosli59564 said:
Get a 4.4.2 fw and flash with windows odin. Not really familiar with mobile odin. Find fw for you country csc. Flashing other csc fw sometimes requires pit file so better get the 1 for your country or originally came with the phone.
Sent from my SM-N920C
Click to expand...
Click to collapse
I'd do that..my csc is for Romania. But I cannot find anywhere on the Internet the fw. And I searched alot
PainCutter said:
I'd do that..my csc is for Romania. But I cannot find anywhere on the Internet the fw. And I searched alot
Click to expand...
Click to collapse
Samsung updates.com.
I can see a few for Romania with CNX, ORO, COA, ROM, HAT csc.
But they very old. Probably not downloadable.
Sent from my SM-G925F
Hey im new to all this note 3 buisuness (just sold my iphone 5s and got myself a nice note 3), so forgive me for my question
I want to flash a new firmware, does the country of the firmware realy matters? because my phone is imported and i have no idea from which country it came.
ps. does flashing a stock firmware will flag the knox?
Thanks
EDIT: flashed a new rom... but failed to flash a firmware
Flashing a stock firmware will not trip knox and use this app from here https://play.google.com/store/apps/details?id=org.vndnguyen.phoneinfo to get device information
daniblk said:
Hey im new to all this note 3 buisuness (just sold my iphone 5s and got myself a nice note 3), so forgive me for my question
I want to flash a new firmware, does the country of the firmware realy matters? because my phone is imported and i have no idea from which country it came.
ps. does flashing a stock firmware will flag the knox?
Thanks
Click to expand...
Click to collapse
Hey thanks for your help..
Maybe you have an idea how to check if my n9005 bootloader is locked? I want to root it, but im afraid to brick it.
daniblk said:
Hey thanks for your help..
Maybe you have an idea how to check if my n9005 bootloader is locked? I want to root it, but im afraid to brick it.
Click to expand...
Click to collapse
what's tour android version??? If already with 4.4 no BL problem you can root it directly with cf auto root or else
if not with 4.4 or you stay with 4.3 and root but many custom roms are not allowed to flash (4.4) or you update with odin and root and can install all 4.4 custom roms
I brought my Samsung Galaxy S4 (China Unicom version) from China. It was unlocked and I was able to use it in my country pretty well. But I didn't get to install any of Google Apps. And then there's awful Chinese apps that I couldn't able to uninstall. So I downloaded AT&T Official Firmware 4.4.2 and decided to give it a try. I am thinking about install it via ODIN.
Now my question is as my phone is currently unlocked and if I install AT&T firmware by ODIN, will it revoke my current unlocked status? Will it take the device back to the AT&T locked status?
Installing the AT&T firmware will flat out fail. And you don't want to install it anyway, unless you like locked bootloaders.
You need to download an I9500 ROM. We should have one here, on the forums. Installing a ROM will not revoke unlocked status.
Strephon Alkhalikoi said:
Installing the AT&T firmware will flat out fail. And you don't want to install it anyway, unless you like locked bootloaders.
You need to download an I9500 ROM. We should have one here, on the forums. Installing a ROM will not revoke unlocked status.
Click to expand...
Click to collapse
My Model Number is GT-I9507V and Baseband version is I9507VZNUBNK1 . And even installing I9507 firmwares failed. Only I9507V firmwares are accepted.
No Google apps so far and these awful Chinese bloatwares. What do I have to do?
I forgot that the China Telecom unit had its own model number. But thank you for stressing it multiple times in bold.
Since the only stock ROMs you can install are I9507V ROMs, your options are to root and debloat the ROM and then install the Google apps, or root and install a custom ROM. This assumes a custom recovery is available for your device.
Strephon Alkhalikoi said:
I forgot that the China Telecom unit had its own model number. But thank you for stressing it multiple times in bold.
Since the only stock ROMs you can install are I9507V ROMs, your options are to root and debloat the ROM and then install the Google apps, or root and install a custom ROM. This assumes a custom recovery is available for your device.
Click to expand...
Click to collapse
There's no CWM recovery available for GT-I9507V. But is it OK to install CWM recovery of GT-I9505?
http://forum.xda-developers.com/showthread.php?t=257785
What model (version) of s4 is exactly this phone? which software is installed on it? is it stock or not ? plzz help and tell me its complete version details
My phone is sgh-i337 or gt-i9505 ? Or only baseband version is i337...or any firmware version difference ? Help
Open the back and remove the battery. Look on the label. Unless the person who sold you the phone physically changed the label, or removed it, it will accurately tell you the hardware version of your phone.
Given that the boot loader and modem (baseband) are for the AT&T version, SGH-I337, it seems likely that the hardware is I337.
Edit: Also, check that it's not a cheap fake clone. There are apps that can check hardware, and run benchmarks, etc. Search "Genuine Galaxy" on the play store.
creepyncrawly said:
Open the back and remove the battery. Look on the label. Unless the person who sold you the phone physically changed the label, or removed it, it will accurately tell you the hardware version of your phone.
Given that the boot loader and modem (baseband) are for the AT&T version, SGH-I337, it seems likely that the hardware is I337.
Edit: Also, check that it's not a cheap fake clone. There are apps that can check hardware, and run benchmarks, etc. Search "Genuine Galaxy" on the play store.
Click to expand...
Click to collapse
On back its printed gt i9505...and I installed genuine galaxy it also says its genunine and model gt i9505......but why baseband is different :/ ?
I think my baseband is of different phone but hows that possible...
why someone would change it...
ahsandon007 said:
I think my baseband is of different phone but hows that possible...
why someone would change it...
Click to expand...
Click to collapse
I've really no clue. I'm not aware whether an AT&T modem will even work on that phone.
If the hardware is genuine GT-I9505, then you will most likely get a more definitive answer in the XDA-Developers forum for that phone.
ahsandon007 said:
What model (version) of s4 is exactly this phone? which software is installed on it? is it stock or not ? plzz help and tell me its complete version details
Click to expand...
Click to collapse
It's most likely an I337 with an I9505 system. Either way, since the bootloader is i337, that means it's locked so if it ever was an I9505 it's not now, but mist likely it wasn't ever.
I checked indownload mode its sgh i337....can I install back stock firmware ...see this site http://www.att.com/esupport/softwareUpdateArticle.jsp?sid=KB419415&cv=820
is it possible to flash through odin this stock lollipop firmware?
Finally I got it....its i337...I checked imei on imei.info it says it is i337 and also checked for blacklist its all clean....and I opened back cover and see it and its written "MADE BY SAMAUNG" ...spelling of samsung is wrong ...it means sticker and software are of 9505 and hardware are i337 at & t usa carrier....I think its changed in korea...phone is converted....now planning to download stock firmware of i337 lollipop and install through odin...
if anyone have link plz share
ahsandon007 said:
Finally I got it....its i337...I checked imei on imei.info it says it is i337 and also checked for blacklist its all clean....and I opened back cover and see it and its written "MADE BY SAMAUNG" ...spelling of samsung is wrong ...it means sticker and software are of 9505 and hardware are i337 at & t usa carrier....I think its changed in korea...phone is converted....now planning to download stock firmware of i337 lollipop and install through odin...
if anyone have link plz share
Click to expand...
Click to collapse
The boot loader is locked, so you can't do this exactly. You can install stock KitKat, install safestrap, and upgrade to lollipop that way. You need to read through the forums to understand what you are doing before you proceed. I'd suggest you do quite a bit of reading, and only flash when you are sure you know what you want to do.
creepyncrawly said:
The boot loader is locked, so you can't do this exactly. You can install stock KitKat, install safestrap, and upgrade to lollipop that way. You need to read through the forums to understand what you are doing before you proceed. I'd suggest you do quite a bit of reading, and only flash when you are sure you know what you want to do.
Click to expand...
Click to collapse
Send me links of threads from which I can understand and also which kitkat version should I install ...if u explain me in detail it will be helpful ..plz
ahsandon007 said:
Send me links of threads from which I can understand and also which kitkat version should I install ...if u explain me in detail it will be helpful ..plz
Click to expand...
Click to collapse
You seem to understand what you are doing. You should be able to figure this out on your own.
Start here.
Also this.
And this.
Or try some of the fine custom firmware in the Android Development forum.
ahsandon007 said:
(in a private message) Hey...there are so many things I cant understand in threads...can you plz tell me step by step how I can update to stock lollipop my sgh i337 ...safestrap etc..stuff ..thnx in advance
Click to expand...
Click to collapse
I do not own this phone, so I can't test or speak from personal experience. I already gave you the links to the information you need ^^^. I don't know if you can receive Over The Air (OTA) firmware updates. You may not be able to if you're not in USA. Also, I'm not sure if you need to be on an AT&T sim. If you can, you can get stock lollipop without root with this method: go to the "[GUIDE]Odin to Stock, Updating, Rooting, and Installing Safestrap" which is the second link. Go to the second post titled "Odin to Stock, Updating, Rooting, and Safestrap Instructions" and click the button to expand the instructions for "OPTION 1 - Stock Lollipop (No ROOT)"
If you cannot receive OTA updates, then currently your option would be to first flash NB1, manually flash the NJ4 update, root and install safestrap. In the Odin to Stock guide, perform both step 1 and step 2 under "NJ4 -- KitKat 4.4.4" After this, you can use the "[How-To] Update to I337_OC3 - 5.0.1 and KeepRoot (4/7/2015) " thread, which is the third link above ^^^.
Your third option would be to wait until the developers post a method for flashing Lollipop directly from Odin.
creepyncrawly said:
I do not own this phone, so I can't test or speak from personal experience. I already gave you the links to the information you need ^^^. I don't know if you can receive Over The Air (OTA) firmware updates. You may not be able to if you're not in USA. Also, I'm not sure if you need to be on an AT&T sim. If you can, you can get stock lollipop without root with this method: go to the "[GUIDE]Odin to Stock, Updating, Rooting, and Installing Safestrap" which is the second link. Go to the second post titled "Odin to Stock, Updating, Rooting, and Safestrap Instructions" and click the button to expand the instructions for "OPTION 1 - Stock Lollipop (No ROOT)"
If you cannot receive OTA updates, then currently your option would be to first flash NB1, manually flash the NJ4 update, root and install safestrap. In the Odin to Stock guide, perform both step 1 and step 2 under "NJ4 -- KitKat 4.4.4" After this, you can use the "[How-To] Update to I337_OC3 - 5.0.1 and KeepRoot (4/7/2015) " thread, which is the third link above ^^^.
Your third option would be to wait until the developers post a method for flashing Lollipop directly from Odin.
Click to expand...
Click to collapse
I successfuly updated to 4.4.2 stock NB1 software manually thorough odin then manually flashed NJ4 by stock recovery...now im not receiving ota update to lolipop....now what nxt to do ? should i root NJ4 and install OC3...
And actually I dont want to root i nedd unrooted stock OC3 ...if you know any direct method to flash..
After update to nj4 4.4.4 im getting delays in sending text msgs and making calls....what to do now should i flash different modem or baseband any ideas ?? :/
Now that you have updated your user account, we can see that you are in Faisalabad, Pakistan using Mobilink carrier. As far as I know, you will not be able to receive an over the air update, nor be able to use Kies to update. Someone who knows more could give a definitive answer on this.
Assuming that you will be unable to use OTA or Kies, your options are:
- root, install safestrap, install rooted OC3
- wait unitl (and if) developers post an Odin flashable version of stock unrooted OC3.
As far as your other issues, you could install the NB1 modem (baseband) and see if that clears up the issues, as it was working before.
creepyncrawly said:
Now that you have updated your user account, we can see that you are in Faisalabad, Pakistan using Mobilink carrier. As far as I know, you will not be able to receive an over the air update, nor be able to use Kies to update. Someone who knows more could give a definitive answer on this.
Assuming that you will be unable to use OTA or Kies, your options are:
- root, install safestrap, install rooted OC3
- wait unitl (and if) developers post an Odin flashable version of stock unrooted OC3.
As far as your other issues, you could install the NB1 modem (baseband) and see if that clears up the issues, as it was working before.
Click to expand...
Click to collapse
I downgraded modem to NB1 and no signal then i used OC3 modem it works bit better than previous one.....lags sometimes ...is there any way to flash 9505 modem to i337 phone ? :/
I upgraded to 5.0.1 using keeproot method of flashfire...thanks broo very very much.....
baseband problem still exists on OC3 modem....i maximum get 3/5 signal bars....can i flash i9505 modem using mobile odin or ant method ?
EDIT: i flashed successfuly 9505 modem but baseband version goes unknown and no sim/signal....is there any fix? Flashing efs?
What if I dwld 9505 lolipop from sammobile and install by odin or flashfire?
hi guys my name is mike i have S5 G900F model with stock 4.4.2 kitkat rooted with towelroot method Knox (0x0)
if i flashed with stock rom again to lolipop i lost root ? if yes can u tell me other way to do it without tripped know of course
ty in advance
nwmn said:
hi guys my name is mike i have S5 G900F model with stock 4.4.2 kitkat rooted with towelroot method Knox (0x0)
if i flashed with stock rom again to lolipop i lost root ? if yes can u tell me other way to do it without tripped know of course
ty in advance
Click to expand...
Click to collapse
Hi Mike, search the forums before asking any questions. Search google. Don't expect everyone to do your job for you. Post your threads in the right section. This question has been asked and answered a million times and you'd know this if you took 5 minutes to search a little bit.
Here's your answer https://www.reddit.com/r/galaxys5/comments/2ubsbs/guide_rooted_android_50_for_the_international/
out of curiosity, why dont you want to trip knox flag
"This question has been asked a million times and you'd know this if you took 5 minutes of your precious time to search a little bit."
Ironic for a man that follows people around *****ing at them to post in Q&A
Sorry guys i have spend many hours on forums to find a anwser but i dont find anything thanx for time anyways the link give me lingo is not exactly what i want i ask if can upgrader via odin in last lolipop stock filmware without loosing root exackly the way i do downgrade and other question is i have unlocked bootloader ? how can find that
i dont want void knox cuz phone is new
nwmn said:
Sorry guys i have spend many hours on forums to find a anwser but i dont find anything thanx for time anyways the link give me lingo is not exactly what i want i ask if can upgrader via odin in last lolipop stock filmware without loosing root exackly the way i do downgrade and other question is i have unlocked bootloader ? how can find that
i dont want void knox cuz phone is new
Click to expand...
Click to collapse
What model do you have? Find out in phone settings in system / phone info. Sm-g900a has locked bootloader. I think verizon's phone also has a locked bootloader.
The link I gave you shows how to upgrade to lollipop, root it and keep knox 0x0.
Isn't that what you're looking for?
lingowistico said:
What model do you have? Find out in phone settings in system / phone info. Sm-g900a has locked bootloader. I think verizon's phone also has a locked bootloader.
The link I gave you shows how to upgrade to lollipop, root it and keep knox 0x0.
Isn't that what you're looking for?
Click to expand...
Click to collapse
i have G900F i think i write it in first post , anyway well that i looking for but not exactly i wanna know if g900f have unlocking bootloader or how can find it and if i upgrade stock rom from kitkat to lolipop i lost root without change modem or anything else downgrade was easy my s5 was braned vodafone germany i download stock rom from samsung mobile and i made unbrand greece whymi must flash modem and why i must use moblile odin that is some questions turture me ty for ur time
ps. always i must put image verification to post this change after 10 post ?
nwmn said:
i have G900F i think i write it in first post , anyway well that i looking for but not exactly i wanna know if g900f have unlocking bootloader or how can find it and if i upgrade stock rom from kitkat to lolipop i lost root without change modem or anything else downgrade was easy my s5 was braned vodafone germany i download stock rom from samsung mobile and i made unbrand greece whymi must flash modem and why i must use moblile odin that is some questions turture me ty for ur time
ps. always i must put image verification to post this change after 10 post ?
Click to expand...
Click to collapse
my bad, you did. 900f has an unlocked bootloader. when you upgrade to stock lollipop through OTA or Kies (or odin) it already includes bootloader and modem. When you do it the way described in that reddit link you flash the lollipop firmware, modem and bootloader separately. Apparently that method of updating needs it to be done so.
Honestly I have Knox 0x1 so I never cared for those methods, btw if you live in Germany then there's no need to care about Knox. In EU we're allowed to flash whatever we want and the guarantee stays intact even if you have Knox 0x1
ps. yes =p
lingowistico said:
my bad, you did. 900f has an unlocked bootloader. when you upgrade to stock lollipop through OTA or Kies (or odin) it already includes bootloader and modem. When you do it the way described in that reddit link you flash the lollipop firmware, modem and bootloader separately. Apparently that method of updating needs it to be done so.
Honestly I have Knox 0x1 so I never cared for those methods, btw if you live in Germany then there's no need to care about Knox. In EU we're allowed to flash whatever we want and the guarantee stays intact even if you have Knox 0x1
ps. yes =p
Click to expand...
Click to collapse
thats is awesome news u r sure bootloader is unlock with all G900F models?
two more questions ty for your petions
1)i still have OTA if upgrade with SuperSU survival mode to last lolipop i keep root/data?
2)if upgrade with odin last lolipop i keep root/data?
nwmn said:
thats is awesome news u r sure bootloader is unlock with all G900F models?
two more questions ty for your petions
1)i still have OTA if upgrade with SuperSU survival mode to last lolipop i keep root/data?
2)if upgrade with odin last lolipop i keep root/data?
Click to expand...
Click to collapse
Honestly, I don't know. That reddit link I gave you, I haven't read the guide myself. I just skimmed though it to be sure it was real but I don't know the details of it. Yes all G900Fs have an unlocked bootloader. :good:
nwmn said:
thats is awesome news u r sure bootloader is unlock with all G900F models?
two more questions ty for your petions
1)i still have OTA if upgrade with SuperSU survival mode to last lolipop i keep root/data?
2)if upgrade with odin last lolipop i keep root/data?
Click to expand...
Click to collapse
Do you mean ota stock firmware notification? If yes then you will have it if Knox is still 0x0 if Knox however is 0x1 you will no longer be able to update via ota.
If you want to upgrade from KitKat to lollipop you must wipe data from recovery to avoid any issues. It is also not recommended by me to use titanium backup to restore apps because some might not be compatible with lollipop yet or some of the app data made for KitKat may have a conflict with lollipop system, however lots of apps have compatibility with lollipop and there is a chance you will have no issues at all when using titanium backup. Even if I said I don't recommend restoring data after such a major upgrade I do recommend having a backup whether it's with titanium backup or nandroid etc because you're able to restore apps one by one and make sure that what you restore won't be problematic.
Edit - if you update with flashfire app, there is an option to keep root when flashing from rooted KitKat to lollipop and users have reported that that feature does work for them (I personally haven't tried it).
Sent from my SM-G900F using Tapatalk
Here's a version of the method on XDA
http://forum.xda-developers.com/gal...2nd-method-t2843044/post54719865#post54719865