Last week I first flash KK baseband, then flash CloudyStock by Cloudyfa, upgrading from JB to KK.
If I want to downgrade to JB by kdz, should I flash JB baseband first? Or the JB baseband has already included inside the JB kdz?
By the way, could someone plz briefly tell me the difference between the efs and the modem? As I know, the modem represents the baseband, right?
a0929418971 said:
Last week I first flash KK baseband, then flash CloudyStock by Cloudyfa, upgrading from JB to KK.
If I want to downgrade to JB by kdz, should I flash JB baseband first? Or the JB baseband has already included inside the JB kdz?
By the way, could someone plz briefly tell me the difference between the efs and the modem? As I know, the modem represents the baseband, right?
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Hello! Are you sure you want to downgrade back to stock with a kdz.? You can always flash a stock 4.2.2 rom if you want that (flash jb baseband first) and keep recovery and root...Or you can just downgrade with kdz, no need to flash JB baseband first, it is included inside the JB KDZ.
The Efs partition is a partition where a lot of important radio data is stored. Without this data, you won’t be able to use your phone correctly. So therefore it is important to have a backup of your efs partition, (because it is unique) in case it gets corrupt.Your modem is a part of the firmware that controls the cell and wifi radios inside the phone, so without a working modem, you would not have data, signal, or wifi connection.
Hope this helps!
Norside said:
Hello! Are you sure you want to downgrade back to stock with a kdz.? You can always flash a stock 4.2.2 rom if you want that (flash jb baseband first) and keep recovery and root...Or you can just downgrade with kdz, no need to flash JB baseband first, it is included inside the JB KDZ.
The Efs partition is a partition where a lot of important radio data is stored. Without this data, you won’t be able to use your phone correctly. So therefore it is important to have a backup of your efs partition, (because it is unique) in case it gets corrupt.Your modem is a part of the firmware that controls the cell and wifi radios inside the phone, so without a working modem, you would not have data, signal, or wifi connection.
Hope this helps!
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First of all, thanks your answer!!
I downgrade to 4.2 by flashing JB baseband first, but there's no D802 TWN modem(I live in Taiwan), can I flash other country's baseband(such Hong Kong, or Europe)?
One more question: whenever I downgrade to JB or upgrade to KK, the efs partition won't be changed, while the modem will vary, right? Sorry for my bad English.
The efs partition will never change if everything is as it should be, and yes you can flash other countries kdz. Keep in mind that you might not get 4g connection because the 4g frequency vary in different countries (like 2600mhz, 1800mhz etc)
Btw do you have a backup of your stock jb rom? You can always flash back to that if you have a backup
And yes the modem will vary from kitkat to jb:good:
Keep in mind that I am not responsible for what you do...but otherwise hope this helps
If I downgrade by means of flashing JB modem then JB rom, not by kdz, my question is: if I flash different countries modem, my 4g may not work, right? Besides this, is there any side-effect?
So the only way to get my original modem is to flash my country's kdz, then use tools to backup my JB modem as well as efs?
I never backup stock JB rom, because it's very easy to flash kdz at the first time, while it has been more complicated last few days.
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Who can plz explain to me?
I tied to go back to sotck 4.2.2 by flashing kdz, i did never found my kdz rom d80220a so i tried to flash other country's kdz but it didn't work with me so i'v to reflash kitkat rom d80220a and it work,so basically i cant go back to stock any more, any suggestions?!
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I've just flashed Echoe 2.1.1 rom over my I9505 and later there is a new firmware update from Sammie - MI1. Will I brick my phone if I flash the new official firmware using Odin? Are there any method where you can safely downgrade to your original rom?
greeny2010 said:
I've just flashed Echoe 2.1.1 rom over my I9505 and later there is a new firmware update from Sammie - MI1. Will I brick my phone if I flash the new official firmware using Odin? Are there any method where you can safely downgrade to your original rom?
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You can Flash Stock firmware using Odin I don't see any issues and if u have a nandroid backup of your old ROM that will also work just fine
B4 doing anything if u have not done Do take a efs backup and nandroid backup and keep it safe somewhere on Pc/ Sd card
and after flashing Stock firmware I suggest full wipe / reset for error free experience
Hi guys, i am doing this for a friend, hes on offial 5.0.1 LP accidentally updated it and he doesnt like it.
we need to root it and then downgrade Bootloader and Modem then flash a Stock based ROM yes !?
i have fetched latest KK modem/BL from a thread on xda , one with WiFi fix supposedly.. and the latest KK BL as well.
but i cant find a Flashable Stock KitKat Rom anywhere.. can someone help me with this please !?
and maybe link me to the stock Modem/BL as well.. cause i dont wanna brick his phone.
for now i have only Rooted it with AutoRoot.
You don't need to root it in order to be able to downgrade. You might even trip Knox in the process, so you're on the safer side if you don't do that. But as you have probably already done that, you could back EFS up using EFS Professional or terminal, just in case it gets corrupted during flashing.
I'm not completely sure about the downgrade process and what it takes not to brick your I9505, but you can find stock KitKat firmwares (flashable in Odin) here and here. There are some stock KitKat firmwares here as well, but some of them are offline. You can find some firmwares at SamMobile too, but you will probably need to pay to download from there.
Some pre-Lollipop modems can be found here, some more modems and bootloaders here.
~ embrosyn
I am on a quite old bootloader and modem as I have not ran any new Roms, or updates to my phone in quite awhile. I was going to try out a new 5.0.1 rom (I am on 4.4.2 now) and was not sure if I would need to update my modem and/or bootloader before I do so.
On SamMobile there is certainly new firmware for my model and carrier, so I was considering flashing the modem and bootloader thru Odin before I try a 5.0.1 rom. Is this recommended/necessary? By flashing a new bootloader, will I lose root or my ability to flash custom roms/kernals/etc?
I tried googling and searching on here first, but could not quite fine the answer. Thank you for any help or guidance.
If you're going to flash a 5.0 touchwiz rom it will update the modem and bootloader I think.
Updating them is not necessary.
People say that flashing newer modems will give you a better signal reception. I have yet to see that "better" signal reception.
You won't lose the ability to flash stuff.
You will only lose root if you flash a stock Samsung rom.
I'm coming from 4.4.1 I want to flash a Lollipop ROM, I haven't flashed for very nearly 2 years. I'm obviously rooted already.
Is coming from KitKat as simple as just flashing a Lollipop ROM? I'm an SM-9005, I've got Odin 3.10 and I want to flash Resurrection-Remix-LP-v5.5.5.
I've seen that I need to backup my PIT and obviously backup my current ROM, do I need to update my baseband or radio etc?
No one?
No need to backup your baseband or radio. RR is an AOSP ROM as far as I know, so you won't be able to flash it with Odin I'm guessing, as it comes as a zip package? I don't have any interest or idea about it, but you can only flash via Odin if the ROM comes as tar image.
Also as you are coming from KK, you 'might' need to flash a stock Lollipop ROM first to update the bootloader from KK to LP, read RR topic, see if its mentioned or not. If its not then you probably don't need to, but as I said no idea.
Hello friends now my gti9505 have custom lollipop rom.UHOJ2 base modem and bl.one suggest me can I flash custom kk base rom?any problem after flash kk base modem bl over on lollipop modem and bl?
Yes it will probably work.
Be sure no problem about baseband and imei lost?
chashmaa said:
Be sure no problem about baseband and imei lost?
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A custom rom never contains a modem or bootloader. So no that does not apply.
It mean no any problems after flashing?
Some custom ROMs require an up-to-date modem and bootloader. If you flash a custom ROM, the imei may disappear or wifi/calls may not work if the ROM is too new for the phone's bootloader and modem.
Before installing a custom ROM on a phone, I make sure that the phone is working properly with the latest stock ROM.
audit13 said:
Some custom ROMs require an up-to-date modem and bootloader. If you flash a custom ROM, the imei may disappear or wifi/calls may not work if the ROM is too new for the phone's bootloader and modem.
Before installing a custom ROM on a phone, I make sure that the phone is working properly with the latest stock ROM.
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He means it the other way around. He wants to use a kitkat rom on a lollipop bootloader and modem. That's shouldn't be a problem.
I see the OP asking 2 questions:
1) Can a KK ROM be flashed to a phone running an LP bootloader and modem. Generally, I would say yes but whether all functions work will depend on the KK ROM. Some custom KK ROMs I ran on my Nexus 5 required me to downgrade the bootloader and radio to KK versions.
2) Can a KK modem and bootloader be flashed over an existing LP modem and bootloader? I think it depends on the phone's installed bootloader.
Yes audit13 brother my quistion is no1. I have now albe95 astra v2 on UHOJ2 base modem and bl lollipop. And goes to goldfinger kk base.now confused what can I do?
Did not try on i9505 but it works on i9500. I think it will work but u should backup your EFS partition
I say try the KK ROM on the LP bootloader and modem. If it doesn't work, you'll either have to find another ROM or you'll have to try and flash a KK bootloader and modem over a LP bootloader and modem.