Develop Bugs

[Q] I want to change rom.. but how?

I'm flashed and rooted etc and i got a rom. And now i wanna change to another one but i cant find a good thread on how to do it..
Do i need to restore etc like the first time so i loose all my setting,apps etc?
Or can i just download one and install it from SDcard?
Sorry for my newb question.. i really dont wanna skrew things up on my phone just change rom
best regards

Download the ROM. Go to Clockwork Recovery, create a backup, then wipe data/cache and go to advanced -> dalvik cache and wipe that. Then install from .zip and find your rom

I presume you've already done a nandroid backup and titanium backup for your apps ? if your changing rom you will need to wipe data/reset in cwm so it will mean restoring your apps and setting up the phone again. then just flash the new rom like you did before with cwm. The rom you choose will probably have some install instructions anyway ? If your updating an existing rom to the new version you can generally just wipe cache and dalvic which means you wont need to setup the phone and apps again.
What you going from and to out of interest ? I'm running bigxies Apex and it really is good.......

joshnichols189 said:
Download the ROM. Go to Clockwork Recovery, create a backup, then wipe data/cache and go to advanced -> dalvik cache and wipe that. Then install from .zip and find your rom
Click to expand...
Click to collapse
i havent made a backup of my apps i think. I used the toolkit to root the phone.. dunno if it does it.. i made some kind of backup..
Sent from my Galaxy Nexus using Tapatalk

This is why people shouldn't just use the Toolkit and then post up BS questions. Learn what you're actually doing and how to do things, everyone else had to

EddyOS said:
This is why people shouldn't just use the Toolkit and then post up BS questions. Learn what you're actually doing and how to do things, everyone else had to
Click to expand...
Click to collapse
Little harsh, but very true.
If you don't know how to do this basic stuff, playing with custom roms and such is a bit dangerous, and quite silly imho
It's not hard, read around the forums a bit, learn what your doing, then and ONLY then, begin to play with things that can turn your phone into an expensive paper weight
Rellikzephyr
Sent from my Galaxy Nexus using Tapatalk

[Q] [q] need information regarding flashing another rom

i have HTC wildfire. using CyanogenMOD 7 for past 2 months. want to install Splash ROM now. i have some queries & want to be sure before doing anything.
1. do i need to remove CyanogenMOD completely before i install other ROM ?
2. if i unROOT my phone again will i be able to re-ROOT it ?
3. if i just flash another ROM from ClockworkMOD Recovery, will it be installed properly ?
please guide me.

Depends the rom you want to install, some roms require you wipe first, so check the rom installation requirement for any specific one you want to install.

!
gsmxpert said:
Depends the rom you want to install, some roms require you wipe first, so check the rom installation requirement for any specific one you want to install.
Click to expand...
Click to collapse
um, well this was my 1st question that if i need to wipe it completely .!
could not find the answers elsewhere .......
guide me step by step please if possible .
Thanks.

prds359 said:
um, well this was my 1st question that if i need to wipe it completely .!
could not find the answers elsewhere .......
guide me step by step please if possible .
Thanks.
Click to expand...
Click to collapse
Could not find or just can't be bothered to look? there are plenty of guides on xda and hundreds if not thousands if you search google for a guide on how to flash a Rom!!
Basically if your flashing a gb Rom over a sense Rom a full wipe is needed.
However if the 2 roms are from the same base i.e cm7 and a cm7 rip-off chances are you might get away without wiping anything, do a backup first if it doesn't work without wiping anything, just wipe cache and dalvik cache but leave data alone. If that still doesn't work try again with a full wipe.
As for the guide its pretty simple, backup wipe then install from zip.

Scratch0805 said:
Could not find or just can't be bothered to look? there are plenty of guides on xda and hundreds if not thousands if you search google for a guide on how to flash a Rom!!
Basically if your flashing a gb Rom over a sense Rom a full wipe is needed.
However if the 2 roms are from the same base i.e cm7 and a cm7 rip-off chances are you might get away without wiping anything, do a backup first if it doesn't work without wiping anything, just wipe cache and dalvik cache but leave data alone. If that still doesn't work try again with a full wipe.
Click to expand...
Click to collapse
ofcourse i do know how to flash a ROM !!
that's how i installed CM7 !!
thanks for answering my 1st query
i would give it a try now.

Q2. If you unroot it you can reroot it again afterwards but I don't see any point unrooting.
Q.3 is basically the same answer as Q.1.

DarkSide Evo 2 ROM

Hey all, i hope this thread clears some doubts about this rom.
I downloaded the the rom and the LC8 radio. I have the necessary files in order to start flashing. I'm having a little trouble finding out the correct procedures to do this. Let me summarize my doubts.
1- Im coming from GB 2.3.6 Juggernaut Rom, if i follow the flash instructions exactly how the dev posted, if anything goes wrong, will i still be able to recover via nandroid?
2- i was reading throughout the post and in the download link for the rom, the dev says that the rom does a full wipe by default, does this mean that i can skip step 6 " flash darkside super wipe" or flash it anyways?
3 and most important... if im coming from GB to ICS, the flashing procedures remain the same? i dont want to brick my phone if im coming from GB based rom. thanks in advance
Thanks in advance. I must point out that i did read the dev's post and used the search feature.
Thank you people and as always thanks for helping

DarkKnight1 said:
Hey all, i hope this thread clears some doubts about this rom.
I downloaded the the rom and the LC8 radio. I have the necessary files in order to start flashing. I'm having a little trouble finding out the correct procedures to do this. Let me summarize my doubts.
1- Im coming from GB 2.3.6 Juggernaut Rom, if i follow the flash instructions exactly how the dev posted, if anything goes wrong, will i still be able to recover via nandroid?
2- i was reading throughout the post and in the download link for the rom, the dev says that the rom does a full wipe by default, does this mean that i can skip step 6 " flash darkside super wipe" or flash it anyways?
3 and most important... if im coming from GB to ICS, the flashing procedures remain the same? i dont want to brick my phone if im coming from GB based rom. thanks in advance
Thanks in advance. I must point out that i did read the dev's post and used the search feature.
Thank you people and as always thanks for helping
Click to expand...
Click to collapse
Here's your steps bud.
1. Backup apps with titanium.
2. Do a nandroid backup through recovery.
3. Download the newest ICS radio. (I believe there's a link in his post.)
4. Download TDJ's tool.
5. Download dark side evoulution rom.
5a. Place all downloaded files on root of SD card.
6. Boot into recovery.
7. Flash the super wipe tool.
8. Flash the radio.
9. Flash the rom.
10. Wipe cache.
11. Wipe dalvik.
12. Fix permissions.
Optional- wipe battery stats.
13. Reboot. 1st boot can take 10 minutes. Let sit till it reads SD card and USB storage as well as loads data.
Optional- I always power off imidiatley after first boot. Then reboot and set up phone.
Have fun let us know if you need more help.
Sent from my Galaxy to yours.

If you're going to give advice then make sure its the advice that the dev gives in his opening post. Flash the ICS radio, flash the ROM. TDJ has super wipe built in and it will wipe caches and fix permissions. If you still need to wipe dalvik TDJ has a cache wipe that also correctly fixes permissions.
"the only problem with the internet is quotes cannot be validated." -Abraham Lincoln

thank you guys i will have fun doing this i will report if i need anything else

As for your question about being able to recover from your nandroid, yes. I always run TDJ's super swipe first, then perform the restore.

LoopDoGG79 said:
As for your question about being able to recover from your nandroid, yes. I always run TDJ's super swipe first, then perform the restore.
Click to expand...
Click to collapse
thank you very much, i already flash the rom and everything is running smoothly thanks again guys for the cooperation

roms and mods

What exactly does modding mean in the smartphone world? Does it mean taking bits and pieces from other roms and putting them into another? How do you do this?

Galaxynote1234 said:
What exactly does modding mean in the smartphone world? Does it mean taking bits and pieces from other roms and putting them into another? How do you do this?
Click to expand...
Click to collapse
No an expert but yes.
Most developer will put different mod for small things like. Icons, status bar, removing the sprint, or something more complicated like a 3 way boot to a rom that will allowed you to boot into recovery once you hold the power button..
Most required root or a special rom running to allowed the tweek or mod to work. Mainly you will need root access or super user access to apply the majority of little tweeks available.
Is not taking from anything is a change to the rom or feature enabling you to do something that your rom did not let you do before
Simple I guess
MIUI Jellybean 2.8.31 B2

redline57 said:
No an expert but yes.
Most developer will put different mod for small things like. Icons, status bar, removing the sprint, or something more complicated like a 3 way boot to a rom that will allowed you to boot into recovery once you hold the power button..
Most required root or a special rom running to allowed the tweek or mod to work. Mainly you will need root access or super user access to apply the majority of little tweeks available.
Is not taking from anything is a change to the rom or feature enabling you to do something that your rom did not let you do before
Simple I guess
MIUI Jellybean 2.8.31 B2
Click to expand...
Click to collapse
Thanks. I'm just curious as to how I install the different tweaks. Say I wanted a notification task bar from one rom onto the rom i already have installed. How do I go about doing that?

Galaxynote1234 said:
Thanks. I'm just curious as to how I install the different tweaks. Say I wanted a notification task bar from one rom onto the rom i already have installed. How do I go about doing that?
Click to expand...
Click to collapse
Is not as easy as to get a specific part of a rom. Is what is available from the developer for your rom.
Sometimes they are tweeks available to most rom in general. You would find that in the developers forum as well on themes.
In general the person providing the tweek will let you know in the first post how to installed or flash the tweek. You would need to read and see if it work on your rom.
Sometimes the best tweeks are apply to a whole rom in general, making that rom the best choice. Making the choice easy as to just flash that rom from the developer. That's when you start following your favorite themer or developer.
MIUI Jellybean 2.8.31 B2

redline57 said:
Is not as easy as to get a specific part of a rom. Is what is available from the developer for your rom.
Sometimes they are tweeks available to most rom in general. You would find that in the developers forum as well on themes.
In general the person providing the tweek will let you know in the first post how to installed or flash the tweek. You would need to read and see if it work on your rom.
Sometimes the best tweeks are apply to a whole rom in general, making that rom the best choice. Making the choice easy as to just flash that rom from the developer. That's when you start following your favorite themer or developer.
MIUI Jellybean 2.8.31 B2
Click to expand...
Click to collapse
Thanks for the help! Really appreciate it. Had another question about roms but I didn't want to start another thread. Lets say I'm currently running the blazer rom and I wanted to start using the jellybomb domination rom. How do I do this. What are the steps because I've read a lot of threads and they just say to do a wipe first then install. So do I just put the file into my external sd storage, do a wipe/factory reset and then install the rom?

Galaxynote1234 said:
Thanks for the help! Really appreciate it. Had another question about roms but I didn't want to start another thread. Lets say I'm currently running the blazer rom and I wanted to start using the jellybomb domination rom. How do I do this. What are the steps because I've read a lot of threads and they just say to do a wipe first then install. So do I just put the file into my external sd storage, do a wipe/factory reset and then install the rom?
Click to expand...
Click to collapse
Assuming you know how to flash and work with clockworkmod.
Make a folder on your internal SD called Root or whatever just to be organized. Place the rom inside the folder. This allowed you to be organized to what you are flashing keeping stuff separate to minimized flashing the wrong file.
What I do before a flash (make sure to reset wallet if you had setup before flashing)
Boot into recovery
Wipe user/data 3x
Wipe cache 3x
Wipe Dalvik 3x
Then look for the zip or installation file on the folder you save it.
Hit flash and you are golden.
Repeat steps for new rom.
Now if you are updating the same rom to a higher versión. The dev. Might tell you just to wipe cache and Dalvik and then flash.
Also there is a advance restore allowing you to just restore your data from a previous version. That way after you flash the update your phone boots with all your apps and setting you had before.
MIUI Jellybean 2.8.31 B2

redline57 said:
Assuming you know how to flash and work with clockworkmod.
Make a folder on your internal SD called Root or whatever just to be organized. Place the rom inside the folder. This allowed you to be organized to what you are flashing keeping stuff separate to minimized flashing the wrong file.
What I do before a flash (make sure to reset wallet if you had setup before flashing)
Boot into recovery
Wipe user/data 3x
Wipe cache 3x
Wipe Dalvik 3x
Then look for the zip or installation file on the folder you save it.
Hit flash and you are golden.
Repeat steps for new rom.
Now if you are updating the same rom to a higher versión. The dev. Might tell you just to wipe cache and Dalvik and then flash.
Also there is a advance restore allowing you to just restore your data from a previous version. That way after you flash the update your phone boots with all your apps and setting you had before.
MIUI Jellybean 2.8.31 B2
Click to expand...
Click to collapse
Thank you!! That clears things up a lot. I think I'll begin by installing Paranoid Android's new Rom and go from there. If I have any other questions I'll just post them in this thread or search for my answer. Thank you again!

Or a PM

Will do

You also need to be aware of whether a ROM is Odexed, or Deodexed. They are not compatible with each other.
Sent from my Sprint Samsung Galaxy S3, running strongsteve's OdexedBlue ROM, using xda-developers app

DrgnRebrn said:
You also need to be aware of whether a ROM is Odexed, or Deodexed. They are not compatible with each other.
Sent from my Sprint Samsung Galaxy S3, running strongsteve's OdexedBlue ROM, using xda-developers app
Click to expand...
Click to collapse
How does that effect flashing? I'm going to flash paranoid android so after I flash that say I want to begin using a different rom. How do I know if it's odexed or deodexed?

[Q] Need some advice for a noobie

Hi first time posting so please take it easy on the noob. So i just rooted my nexus 7 2013. The main reason was because i wanted to be able to extend battery life and the main thing is that i bought a micro usb host otg cable with power and want to be able to charge as well as power my external hard drive. now i read that elementalx kernel allows you to do that. Would i flash the elementalx kernel first or do i flash a rom before a kernel. I'm pretty confused on where to go to download and which one i flash first.

Welcome to an experience with a great tablet! You want to flash a kernel after a ROM. As the intro to ElementalX says,
Installing a new ROM
If you install a new ROM, it will probably replace this with the stock kernel and will definitely overwrite /etc/init.d/99elementalx and /etc/elementalx.conf so you will lose your settings and certain features. So always reinstall the kernel after installing a ROM.

Pandae said:
Welcome to an experience with a great tablet! You want to flash a kernel after a ROM. As the intro to ElementalX says,
Installing a new ROM
If you install a new ROM, it will probably replace this with the stock kernel and will definitely overwrite /etc/init.d/99elementalx and /etc/elementalx.conf so you will lose your settings and certain features. So always reinstall the kernel after installing a ROM.
Click to expand...
Click to collapse
can you install any rom with any kernel. are their roms that will be more compatible with certain kernels. lastly is flashing a rom and kernel the same process of wiping out all the cache then installing while in recovery mode?

j0hnnyyyy said:
can you install any rom with any kernel. are their roms that will be more compatible with certain kernels. lastly is flashing a rom and kernel the same process of wiping out all the cache then installing while in recovery mode?
Click to expand...
Click to collapse
For the most part there will be two types of ROMs
#AOSP based ROMs
#Cyanogen based ROMs
Each kernel and ROM developer will state in the OP (original post; first post of the thread) which source they built their ROM off of.
As a general rule, flash AOSP based kernels for AOSP based ROMs and Cyanogen based kernels for Cyanogen based ROMs.
Flashing a ROM usually requires a factory reset in recovery (apps will be gone, but your personal data/media will be intact) if coming from another ROM. For example you are on ROM A and want to try ROM B, you must factory reset and wipe caches and flash ROM B.
Once you are on ROM B and if the developer updates ROM B, you can sometimes flash ROM B without the factory reset and only perform the wiping of the caches (this is called a dirty flash).
** IMPORTANT ** Each ROM might have their own special instructions for installation, so always read the first 2 or 3 posts of the thread to get all the important info you need.
If you need help:
1. Check the OP
2. Use the search function in the thread
3. Google it
4. After you have done that and still can't find an answer, post in the respective thread about your problem and provide as much detail as possible.
The reason for this is because threads sometimes get spammed with the same questions over and over again, which clog up the thread unnecessarily. Your question might have been asked before, so searching to see if the question has been asked can also lead you to the answer!
Another thing I've learned is to use the thanks button for those developers whose ROM or kernel you use and like, and people who have helped you. Sometimes donating money to developers to show support isn't a viable option for some, but using the thanks button to show appreciation can go a long way as well!
Hope this helps!
- Another noob

Protomartyr said:
For the most part there will be two types of ROMs
#AOSP based ROMs
#Cyanogen based ROMs
Each kernel and ROM developer will state in the OP (original post; first post of the thread) which source they built their ROM off of.
As a general rule, flash AOSP based kernels for AOSP based ROMs and Cyanogen based kernels for Cyanogen based ROMs.
Flashing a ROM usually requires a factory reset in recovery (apps will be gone, but your personal data/media will be intact) if coming from another ROM. For example you are on ROM A and want to try ROM B, you must factory reset and wipe caches and flash ROM B.
Once you are on ROM B and if the developer updates ROM B, you can sometimes flash ROM B without the factory reset and only perform the wiping of the caches (this is called a dirty flash).
** IMPORTANT ** Each ROM might have their own special instructions for installation, so always read the first 2 or 3 posts of the thread to get all the important info you need.
If you need help:
1. Check the OP
2. Use the search function in the thread
3. Google it
4. After you have done that and still can't find an answer, post in the respective thread about your problem and provide as much detail as possible.
The reason for this is because threads sometimes get spammed with the same questions over and over again, which clog up the thread unnecessarily. Your question might have been asked before, so searching to see if the question has been asked can also lead you to the answer!
Another thing I've learned is to use the thanks button for those developers whose ROM or kernel you use and like, and people who have helped you. Sometimes donating money to developers to show support isn't a viable option for some, but using the thanks button to show appreciation can go a long way as well!
Hope this helps!
- Another noob
Click to expand...
Click to collapse
thanks this helped out a lot and completely understand about not trying to repost questions that have been answered. Just one question if i flash a rom and do a backup. then flash a completely different rom and do a backup for that as well I'm guessing ill have back up for both roms. my question is i use twrp and have the app online nandroid backup, would it be better to go into recovery and backup or is it safe to use the app? Also after flashing a rom is it the same process to flash the kernel?

Yes, it is the same process. Some flashable zip packages are included with the AROMA installer, which is a simple interface to give you options as you flash. Be sure to wipe Cache and Dalvik Cache after flashing roms and kernels.
Don't bother asking for the best Rom and Kernel combo. Try them out for yourself, if you truly want to learn more about what you are doing. Please don't become another user looking for a quick fix. (You called yourself a noobie, so I assume that you intend to learn more.)
Read, read, read! Follow the advice of the users who replied to you! It could save your life! Or, at least, save you a brick.
Most importantly, DON'T PANIC when your device doesn't get past the boot animation. Most likely, you asked something that doesn't work well with the Rom/kernel/MOD combo. Reboot into recovery, wipe, and try again.
Extra tips: clean flash whenever you can. You tend to lose track of stuff that you have flashed when you dirty flash a few times, and not every mod gets removed completely. Backup often as well.
Feel free to come back if you need more help.
_______________________________________
Phone: HTC EVO 4G LTE
Sense 5, S-Off
Tablet: ASUS Nexus 7.2
Rooted, Custom Rom & Kernel
_______________________________________

aarsyl said:
Yes, it is the same process. Some flashable zip packages are included with the AROMA installer, which is a simple interface to give you options as you flash. Be sure to wipe Cache and Dalvik Cache after flashing roms and kernels.
Don't bother asking for the best Rom and Kernel combo. Try them out for yourself, if you truly want to learn more about what you are doing. Please don't become another user looking for a quick fix. (You called yourself a noobie, so I assume that you intend to learn more.)
Read, read, read! Follow the advice of the users who replied to you! It could save your life! Or, at least, save you a brick.
Most importantly, DON'T PANIC when your device doesn't get past the boot animation. Most likely, you asked something that doesn't work well with the Rom/kernel/MOD combo. Reboot into recovery, wipe, and try again.
Extra tips: clean flash whenever you can. You tend to lose track of stuff that you have flashed when you dirty flash a few times, and not every mod gets removed completely. Backup often as well.
Feel free to come back if you need more help.
_______________________________________
Phone: HTC EVO 4G LTE
Sense 5, S-Off
Tablet: ASUS Nexus 7.2
Rooted, Custom Rom & Kernel
_______________________________________
Click to expand...
Click to collapse
thanks. I flashed cleanrom and wiped all the cache before doing so. then i flash elementalx but i didn't wipe cache. one of my friend told me it doesn't really matter that much for kernels but does for roms. he also suggested i wait before rebooting after installing a rom in recovery mode. can you answer any of the part of waiting a certain period of time to let the rom and kernel set?

j0hnnyyyy said:
thanks. I flashed cleanrom and wiped all the cache before doing so. then i flash elementalx but i didn't wipe cache. one of my friend told me it doesn't really matter that much for kernels but does for roms. he also suggested i wait before rebooting after installing a rom in recovery mode. can you answer any of the part of waiting a certain period of time to let the rom and kernel set?
Click to expand...
Click to collapse
Your friend was correct on both accounts.
Wiping cache is not really necessary when flashing kernels.
It it's also usually a good practice to wait a bit before your first reboot after flashing a ROM. From my understanding, it allows the code to "settle"and make sure everything completes in the initial boot.
I'm not too sure about the reasoning, so if someone knows then feel free to chime in!
Sent from my Nexus 4 using xda app-developers app

Protomartyr said:
Your friend was correct on both accounts.
Wiping cache is not really necessary when flashing kernels.
It it's also usually a good practice to wait a bit before your first reboot after flashing a ROM. From my understanding, it allows the code to "settle"and make sure everything completes in the initial boot.
I'm not too sure about the reasoning, so if someone knows then feel free to chime in!
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
he tried explaining to me over text but confused so go into recovery mode wipe all cache. then click install. find file swipe to install then page comes to reboot. on that reboot page is that when you wait or click reboot then wait?

j0hnnyyyy said:
he tried explaining to me over text but confused so go into recovery mode wipe all cache. then click install. find file swipe to install then page comes to reboot. on that reboot page is that when you wait or click reboot then wait?
Click to expand...
Click to collapse
Once you get to the reboot screen in recovery, go ahead and reboot. It's after you reboot that first time that you should wait some time.
Sent from my Nexus 4 using xda app-developers app

Protomartyr said:
Your friend was correct on both accounts.
Wiping cache is not really necessary when flashing kernels.
It it's also usually a good practice to wait a bit before your first reboot after flashing a ROM. From my understanding, it allows the code to "settle"and make sure everything completes in the initial boot.
I'm not too sure about the reasoning, so if someone knows then feel free to chime in!
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Sorry, I didn't know that about Nexus devices. I always wipe caches for my phone, because I will enter a bootloop if I do not do so. This is my first Nexus device, and I'm learning a lot of new things myself.
_______________________________________
Phone: HTC EVO 4G LTE
Sense 5, S-Off
Tablet: ASUS Nexus 7.2
Rooted, Custom Rom & Kernel
_______________________________________

I have a question about backups. I've been researching and reading lot but there are a lot of different opinions . so I installed cleanrom with elemntalx kernel. Would it be best to make a backup in recovery mode or use online nandroid backup. I read something like online nandroid backup works only on certain Roms. Also I have titanium backup but I read that it isn't good to use titanium backups on different Roms? So if I backup through titanium backup and flash let's say a different ROM like cyanogenmod ROM I can't use the backup I created when I had cleanrom flashed?

j0hnnyyyy said:
I have a question about backups. I've been researching and reading lot but there are a lot of different opinions . so I installed cleanrom with elemntalx kernel. Would it be best to make a backup in recovery mode or use online nandroid backup. I read something like online nandroid backup works only on certain Roms. Also I have titanium backup but I read that it isn't good to use titanium backups on different Roms? So if I backup through titanium backup and flash let's say a different ROM like cyanogenmod ROM I can't use the backup I created when I had cleanrom flashed?
Click to expand...
Click to collapse
Nandroid and Titanium backups are used for different purposes.
Titanium backups deal with apps and app settings. They are useful when after flashing a ROM Update. For example, you are using ROM A revision 1 and the developer has posted a new update ROM A revision 2. Since it's usually recommended to clean flash updates of a ROM (read the OP of the ROM thread for further info), this would result in you having to reinstall all your apps and reapply settings and such (which takes time). However with titanium backup, all you have to do is make sure you backup apps/settings when on revision 1. Then after you flash revision 2, you can restore your titanium backup and now you have all your apps and settings.
** IMPORTANT ** Titanium backups should not be used when moving to a DIFFERENT ROM. This may cause problems/incompatibilities.
Nandroid Backups are basically system images. So basically it just takes a snapshot of the current state of your phone, and when you restore it it will be the same as if nothing has changed. This is especially helpful in two situations:
1) when trying different ROMs (i.e. you flash another ROM but don't like it, you can easily switch back via the nandroid backup)
2) when messing with system files and reverting to a previous state (i.e. you are trying to mod your navigation bar or some other customization and decide you don't like it or accidentally messed up. You can use the nandroid backup to revert those changes)
It's also usually helpful to take backups at the appropriate time and name them accordingly. For example, this is the process I take when flashing a custom mod.
1) Nandroid backup before you apply custom mod A. I name the backup "Before applying custom mod A"
2) Apply custom mod A
3) If all goes well and mod A works, I also make a nandroid backup after this and name it "Applied custom mod A"
OR
If custom mod A messes up my phone, I just restore the backup named "Before applying custom mod A"
The reason why I also make a nandroid backup after successfully applying mod A (and decide to keep the mod) is so that I can have an up to date restore point. If you make modifications to the phone and decide to keep them, make an updated nandroid so you don't have to reapply the modifications again.
Sorry for the long wall of text, but hope this helps!

Protomartyr said:
Nandroid and Titanium backups are used for different purposes.
Titanium backups deal with apps and app settings. They are useful when after flashing a ROM Update. For example, you are using ROM A revision 1 and the developer has posted a new update ROM A revision 2. Since it's usually recommended to clean flash updates of a ROM (read the OP of the ROM thread for further info), this would result in you having to reinstall all your apps and reapply settings and such (which takes time). However with titanium backup, all you have to do is make sure you backup apps/settings when on revision 1. Then after you flash revision 2, you can restore your titanium backup and now you have all your apps and settings.
** IMPORTANT ** Titanium backups should not be used when moving to a DIFFERENT ROM. This may cause problems/incompatibilities.
Nandroid Backups are basically system images. So basically it just takes a snapshot of the current state of your phone, and when you restore it it will be the same as if nothing has changed. This is especially helpful in two situations:
1) when trying different ROMs (i.e. you flash another ROM but don't like it, you can easily switch back via the nandroid backup)
2) when messing with system files and reverting to a previous state (i.e. you are trying to mod your navigation bar or some other customization and decide you don't like it or accidentally messed up. You can use the nandroid backup to revert those changes)
It's also usually helpful to take backups at the appropriate time and name them accordingly. For example, this is the process I take when flashing a custom mod.
1) Nandroid backup before you apply custom mod A. I name the backup "Before applying custom mod A"
2) Apply custom mod A
3) If all goes well and mod A works, I also make a nandroid backup after this and name it "Applied custom mod A"
OR
If custom mod A messes up my phone, I just restore the backup named "Before applying custom mod A"
The reason why I also make a nandroid backup after successfully applying mod A (and decide to keep the mod) is so that I can have an up to date restore point. If you make modifications to the phone and decide to keep them, make an updated nandroid so you don't have to reapply the modifications again.
Sorry for the long wall of text, but hope this helps!
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thanks very helpful so using the online nandroid backup app is the same thing as making a backup in twrp recovery mode