Develop Bugs

[Q] How to Backup stock Kernel + ROM ?

Hello Guys !
I wanna try some custom ROM so before doing that want to backup my Kernel & ROM. If anything gone wrong so I can revert back to original ROM.
My Cell details:
Xperia Arc S
LT18i
Android Version 2.3.4
Baseband Version -64
Build number
4.0.2.a.0.62
Locked bootloader
& unrooted.
Please someone guide me....
Thanks in advance...

If your bootloader's locked then you can't back up. You can only reload(repair)it from PC companion.
sinkster©

Thanks sinkster !
Ok done unlocked bootloader.
Then advice the further steps...

XPERIA CWM AUTO INSTALLER
download this app and install CWM recovery on ur phone...
Then reboot ur phone into recovery mode...
TO DO THIS, LONG PRESS BACK BUTTON WHILE THE PHONE RE-BOOTS
(OR)
KEEP TAPPING VOLUME DOWN BUTTON...
After it boots into recovery, go to BACKUP & RESTORE and Select Backup...
This will create a NANDROID BACKUP on your phone exactly as it is...including apps n contacts n all other data..
you can find it in SDCARD/Clockworkmod/Backup/
Good day...

If you wanted to take a backup without installing CWM you can use fastboot to boot (not flash) a kernel that has CWM built in.

thanks amulbaby
I will try and get back here with comment ...
EDIT:
I tried that steps but it will works only on rooted phone ..., can not enter in to recovery mode by pressing any key, it normally boots up and appear home ...

smartarse93 said:
If you wanted to take a backup without installing CWM you can use fastboot to boot (not flash) a kernel that has CWM built in.
Click to expand...
Click to collapse
How to do so... any guide links pls .. .

ShresthasR said:
thanks amulbaby
I will try and get back here with comment ...
EDIT:
I tried that steps but it will works only on rooted phone ..., can not enter in to recovery mode by pressing any key, it normally boots up and appear home ...
Click to expand...
Click to collapse
Why don't you root it with flashtool then?
But for that u wud have to downgrade to .42, with flashtool before rooting

Hey I am also wondering about this. I have lt15i flashed with Official .562, locked bootloader and CWM installed via flashtool.
Which ICS roms will work with official .562 and locked bootloader? I have been searching all morning but not a lot of updates regarding this since the official .562 release.

djsneak1 said:
Hey I am also wondering about this. I have lt15i flashed with Official .562, locked bootloader and CWM installed via flashtool.
Which ICS roms will work with official .562 and locked bootloader? I have been searching all morning but not a lot of updates regarding this since the official .562 release.
Click to expand...
Click to collapse
PROBABLY THIS ..... NOT SURE ....
T.E.A.M. Stock Rom for 2011 Xperia devices

amulbaby said:
Why don't you root it with flashtool then?
But for that u wud have to downgrade to .42, with flashtool before rooting
Click to expand...
Click to collapse
Here is the point I was looking for these alternative . . .
I have STOCK ROM with 4.0.2.a.0.62, actually I want to backup these stuff, I read about that downgrading via flashtool and root, if I flashed via flashtool that STOCK ROM will wipe...
Anyway here what I did to make a copy of my stock firmware & upgraded to ICS firmware & rooted.
Repaired my phone using Sony update service to download and backup STOCK firmware
Flashed with flashtool official firmware LT18i 4.1.A.0.562 NCB Icecream Sandwich Official

First you need to download a kernel that has cwm built in, I would search for recoveryARC.IMG then you also need fastboot from the SDK.
All you would do is connect your phone I'm fastboot then run in a command prompt fastboot boot recoveryARC.IMG. Your phone would then boot using that kernel and you can enter cwm by pressing the vol down several times. This process wouldn't flash your kernel only load it temporarily.
I would try and find a guide about them but I'm on my phone.
Sorry just noticed you've already done it, congrats enjoy ics.
Sent from my LT18i using XDA

smartarse93 said:
First you need to download a kernel that has cwm built in, I would search for recoveryARC.IMG then you also need fastboot from the SDK.
All you would do is connect your phone I'm fastboot then run in a command prompt fastboot boot recoveryARC.IMG. Your phone would then boot using that kernel and you can enter cwm by pressing the vol down several times. This process wouldn't flash your kernel only load it temporarily.
I would try and find a guide about them but I'm on my phone.
Sorry just noticed you've already done it, congrats enjoy ics.
Sent from my LT18i using XDA
Click to expand...
Click to collapse
Thanks bro ...
I already upgraded, anyway I want to know the process, you mentioned here this process wouldn't flash kernel only load it temporarily, I am confused...
Could you describe in details .. ? Actual what happens if we flash recovery img...

Well you can use fastboot to install the kernel which overwrites the previous one, or you can use it boot the kernel which just sends the kernel to the phone which the boots and temporarily uses the kernel. However when the phone next shuts down it will return to normal use.
If you flash a kernel it writes the .IMG to the boot partition. So if I wanted to use a kernel that stayed between reboots I would use 'fastboot flash boot kernelname.IMG'
However if I was running stock I could use recoveryARC.IMG with cwm, and do fastboot boot recoveryARC.IMG then run update.zip as normal. Then all you have to do is reboot, you'll be back to stock but the update would still be installed.
Sorry if it's not cleat, the best I could do on my phone.
Sent from my LT18i using XDA

Please elaborate on backing up STOCK ROM
ShresthasR said:
Here is the point I was looking for these alternative . . .
I have STOCK ROM with 4.0.2.a.0.62, actually I want to backup these stuff, I read about that downgrading via flashtool and root, if I flashed via flashtool that STOCK ROM will wipe...
Anyway here what I did to make a copy of my stock firmware & upgraded to ICS firmware & rooted.
Repaired my phone using Sony update service to download and backup STOCK firmware
Flashed with flashtool official firmware LT18i 4.1.A.0.562 NCB Icecream Sandwich Official
Click to expand...
Click to collapse
Can you please give me details on you did this? It is precisely what I want to do (ie. Backup the stock carrier rom on my Xperia Arc before flashinging an old ROM in order to root it).
Did you use the "repair" option from "Sony PC Companion 2.1>Support Zone>Phone software update>repair phone"?
Or did you use the software from here: http: // w ww(dot)sonymobile(dot)com/gb/tools/update-service/
Can you please tell me the whole procedure on how you did the backup of the STOCK ROM? Thanks!

King of Procrastinators said:
Can you please give me details on you did this? It is precisely what I want to do (ie. Backup the stock carrier rom on my Xperia Arc before flashinging an old ROM in order to root it).
Did you use the "repair" option from "Sony PC Companion 2.1>Support Zone>Phone software update>repair phone"?
Or did you use the software from here: http: // w ww(dot)sonymobile(dot)com/gb/tools/update-service/
Can you please tell me the whole procedure on how you did the backup of the STOCK ROM? Thanks!
Click to expand...
Click to collapse
Actually what I did just followed this guide
http://forum.xda-developers.com/showthread.php?t=1304634
At this thread just follow the video tutorial under section
"How to backup your carrier firmware using Update Service"
Youtube link: http://youtu.be/bB77gWRUI_A
Thanks XperienceD for nice guide

just want to ask, does CWM backup also backups the kernel or firmware?
and how do i restore stock kernel with or without using ODIN?
how do i go on flashing custom firmware? i really do need explanation especially for the .img file that i have been seeing guys.
please help me out because i really want to learn more about software and stuff.
thank you very much and god bless you guys.

ROM backup OK; How to take backup of Kernel
I am using Sony Xperia Ray ST18i
used it for a year with stock kernel and ROM
rooted it long ago, but was afraid of custom ROMs
last month I unlocked bootloader, flashed ROM and custom ROM (beanstalk 4.3.075), enjoying it but obviously not so stable like stock
Now if I wish to move back to my stock kernel and ROM
what steps are required.
I suppose
1. flash the stock kernel
2. restore from backed up ROM (I do have nandroid backup of stock ROM)
but how to achieve the step 1, as I learnt nandroid backup doesn't backs up ROM.
My collegue is having same phone still on stock, Can I use his phone somehow to extract kernel. I searched and found a zip to be used through CWM which backs up kernel it was meant for some samsung phone I tried but failed.
Thanks in advance.
Do I need to supply some more information to get help?

Backup stock ROM
I used this backup guide, but dont know if it will work for you http://helpadude.com/how-to-backup-your-android-rom/
If it does plz give thanks

[Acro S][Kernel] Stock Kernel + CWM + Root (updated latest 6.1.A.2.55)

[Disclaimer] Do it at your own risk. I am not responsible for anything happened to your phone.
Hi all, I've just upgraded my phone to Acro S recently. It is running ICS 4.0.4 build 6.1.A.1.58. It has been updated to 6.1.A.2.55
So here is a modified Stock Kernel with CWM which I created based on Arakmar's Stock ICS kernel (Build 11) for XS
Credits:
1. Arakmar - for the ramdisk and CWM
2. DoomLord and FXP team - for too many things to mention
Link (do not mirror)
6.1.A.2.55 - http://www.mediafire.com/?zuzatcl3it3zce7
6.1.A.2.50 - http://www.mediafire.com/?jrjiwg13w3gvxpf
6.1.A.2.45 - http://www.mediafire.com/?rq43glb93khd9ia
6.1.A.1.58 - http://www.mediafire.com/?wsuha53wvcc3cav
Instructions:
1. Unzip the files to the fastboot folder, there are 2 files:
kernel.sin -- Stock ICS Kernel
kernel-cwm.elf -- Stock ICS Kernel with init.d support and CWM 5.5.0.4
2. Get into fastboot mode, type:
- To flash the CWM kernel
Code:
fastboot flash boot kernel-cwm.elf
- To flash back the Stock kernel
Code:
fastboot flash boot kernel.sin
To get into CWM - Reboot your phone, tap the screen (not buttons) a few times when the blue led and button lights appear
To root your phone, follow instructions here: http://forum.xda-developers.com/showpost.php?p=30320507&postcount=11
If you like it, please hit the [Thanks] button or you can buy me a beer

Thank you.
But i have a question: what is ram disk use for?
I used xperia s mod kernel to flash supersu.apk, then flash back stock arco s kernel, and add CMW. But some .zip file can not use.

Does this give us root or do i need to root the phone first and then flash this kernel ?
Also, do we need to unlock bootloader for this ?

Can anyone please comment on performance? Thanks in advance!!

Hi do i need to flash these 2 files or just one i want cwm.and does it include root or not?

mercury_beta said:
Thank you.
But i have a question: what is ram disk use for?
I used xperia s mod kernel to flash supersu.apk, then flash back stock arco s kernel, and add CMW. But some .zip file can not use.
Click to expand...
Click to collapse
ramdisk is part of kernel. it runs initial scripts that control how the phone starts.
dusanzk said:
Does this give us root or do i need to root the phone first and then flash this kernel ?
Also, do we need to unlock bootloader for this ?
Click to expand...
Click to collapse
You need to unlock bootloader first. This kernel won't give you root. But you can boot into cwm to flash any package that root your phone or you can flash a complete rom, if available.
john9 said:
Can anyone please comment on performance? Thanks in advance!!
Click to expand...
Click to collapse
There is no difference in performance as stock kernel
noriya said:
Hi do i need to flash these 2 files or just one i want cwm.and does it include root or not?
Click to expand...
Click to collapse
You need to flash only the one with cwm. It won't root your phone.

Thanks for your reply,is it ok to flash cwm without root first?and unlock bootloader is the same xperia s right?

cobrato said:
[Disclaimer] ]
Hi all, I've just upgraded my phone to Acro S recently. It is running ICS 4.0.4 build 6.1.A.1.58
)
Click to expand...
Click to collapse
Could you make a pre-root one?

I am sorry.
Although I checked, and kernel.sin of original and kernel.sin of cobrato are the same, is it right now?

puriketsuangel said:
I am sorry.
Although I checked, and kernel.sin of original and kernel.sin of cobrato are the same, is it right now?
Click to expand...
Click to collapse
I think you're right. The moded kernel is kernel-cwm.elf.

Root Package
Here is the Root package after you flash the kernel with cwm
To root your phone:
1. copy the RootPhone.zip file to sdcard (internal storage)
2. reboot into cwm
3. install the package
4. reboot
Link:
http://www.mediafire.com/?11rhxm1k490edxz

papacarla said:
I think you're right. The moded kernel is kernel-cwm.elf.
Click to expand...
Click to collapse
Sorry.
Ｔhanks　alot.

It works on Acro HD with Acro S's ICS ROM flashed exlude baseband.
UPD: I did not like the ICS. There are only 320 mb of free RAM. I have 460 mb of free RAM on 2.3.7. So, I installed back the 2.3.7

if you could add 2way call recording patch to this kernel would be great

cobrato said:
Here is the Root package after you flash the kernel with cwm
To root your phone:
1. copy the RootPhone.zip file to sdcard (internal storage)
2. reboot into cwm
3. install the package
4. reboot
Link:
http://www.mediafire.com/?11rhxm1k490edxz
Click to expand...
Click to collapse
This worked for me, unlocked bootloader, flashed kernel-cwm and then flashed rootphone in CWM. Thanks.
Just a suggestion,
You might wanna add "+ Root" to your title seeing as this is another way to root the device.

With CWM, can we then flash custom ROMs for Xperia S or a Kernel with permanent root (e.g. DoomKernel)?
I'd like to get rid of all the Facebook-crap in the stock ROM but if it will be there again after the next update from Sony it's no use.

skycamefalling said:
With CWM, can we then flash custom ROMs for Xperia S or a Kernel with permanent root (e.g. DoomKernel)?
I'd like to get rid of all the Facebook-crap in the stock ROM but if it will be there again after the next update from Sony it's no use.
Click to expand...
Click to collapse
Once you unlock bootloader, you can flash any custom kernel.
If the kernel comes with CWM, you can flash any rom/zip with root
But I think current S custom kernels/roms are based on older version: 6.1.A.0.452

Bootloader unlock will probably void warranty.
But how about rooting? No righht?

Where to find the tools for unlocking bootloader.
Would appreciate a link if anybody now...

SweKen said:
Where to find the tools for unlocking bootloader.
Would appreciate a link if anybody now...
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=1527159
It's the same method for Xperia P/U/S/Acro S.

[Q] XTXperience 9 problem. don't bite my head off guys.

I am pretty new to flashing ROMS and rooting. I rooted my S2 back in 2011. but since then I haven't. So i though I would do it with the Xperia S.
I installed XTXperience 9, unlocked bootloader. rooted n fastboot. I downloaded cwm recovery. cleared everything. installed the ROM, and It has got stuck in boot loop.
I was on the 6.1.A.2.45 firmware if that helps?
could someone please give me some short instructions and tell me what I am doing wrong I need this ROM looks so cool!
Please don't bite my head off either. I need help. it's only way i'll learn

Please someone

If you have unlocked bootloader, why don't you install a custom kernel? Like Advanced ICS Kernel, ELiTE, etc.

Nek0x90 said:
If you have unlocked bootloader, why don't you install a custom kernel? Like Advanced ICS Kernel, ELiTE, etc.
Click to expand...
Click to collapse
Not sure how to do that yet. would that possibly fix the boot loop I am having??

I've never installed a recovery manually, because I've always flashed a custom kernel with a recovery included, maybe that's why you're having a boot loop but I'm not sure.
If you already unlocked the bootloader you should flash a stock based kernel and that's it.

Nek0x90 said:
I've never installed a recovery manually, because I've always flashed a custom kernel with a recovery included, maybe that's why you're having a boot loop but I'm not sure.
If you already unlocked the bootloader you should flash a stock based kernel and that's it.
Click to expand...
Click to collapse
Okay well I have stock kernal I only tried flashing the ROM. how do I get out of this boot loop?

Flash a stock firmware with Flashtool.

Nek0x90 said:
Flash a stock firmware with Flashtool.
Click to expand...
Click to collapse
That did it. back on stock now. should I try flashing the custom ROM again?

Yes, and you can also try flashing a custom kernel.
Just follow this tutorial: http://forum.xda-developers.com/showthread.php?t=1527159

Nek0x90 said:
Yes, and you can also try flashing a custom kernel.
Just follow this tutorial: http://forum.xda-developers.com/showthread.php?t=1527159
Click to expand...
Click to collapse
I unlocked the bootloader before it got in the bootloop. after flashing firmware I guess it is still unlocked. just need to root it again

If you already have you bootloader unlocked just flash a custom kernel! If you flash a ROM after that, it will be pre-rooted.

Nek0x90 said:
If you already have you bootloader unlocked just flash a custom kernel! If you flash a ROM after that, it will be pre-rooted.
Click to expand...
Click to collapse
any short instructions or link where I can learn how to install a custom kernel?

hey click my signature "Read ME"

technostein said:
any short instructions or link where I can learn how to install a custom kernel?
Click to expand...
Click to collapse
Just download zip & flash in your phone's recovery. Clear cache & dalvik cache before that
Press Thanks
Sent from my Xperia S using xda premium

technostein said:
I am pretty new to flashing ROMS and rooting. I rooted my S2 back in 2011. but since then I haven't. So i though I would do it with the Xperia S.
I installed XTXperience 9, unlocked bootloader. rooted n fastboot. I downloaded cwm recovery. cleared everything. installed the ROM, and It has got stuck in boot loop.
I was on the 6.1.A.2.45 firmware if that helps?
could someone please give me some short instructions and tell me what I am doing wrong I need this ROM looks so cool!
Please don't bite my head off either. I need help. it's only way i'll learn
Click to expand...
Click to collapse
I tried with .45. .55 .50 Gb firmwares . Only .50 firmware gave me success like mentioned in the tutorial. :good:
Hit thanks if i helped

[Q] CWM Recovery for .200 JB Stock ROM

Before i flash this kernel:
http://forum.xda-developers.com/showthread.php?t=2302393
I just want to make sure that flashing this kernel will bring the cmw recovery i need to flash custom roms to my xperia s with jelly ben stock rom .200.
At the moment my xperia s ist unlocked and rooted.
What i don´t know, is it possible to flahs via flashtool any older rom with flashtool as tft-file. does it contain the older kernel ?

look
Bastler1 said:
Before i flash this kernel:
http://forum.xda-developers.com/showthread.php?t=2302393
I just want to make sure that flashing this kernel will bring the cmw recovery i need to flash custom roms to my xperia s with jelly ben stock rom .200.
At the moment my xperia s ist unlocked and rooted.
What i don´t know, is it possible to flahs via flashtool any older rom with flashtool as tft-file. does it contain the older kernel ?
Click to expand...
Click to collapse
notes
you cant flash a ICS kernel for a JB ROM , or the other way around
you can how ever flash any JB kernel on any JB rom , so long as they are from the same source e.g. sony rom + sony kernel
sony kernel + cm rom = no
ENSURE THAT YOUR BOOTLOADER IS UNLOCKED

I thought that CWM-Based Recovery 6.0.3.2 for Xperia S {Official JB firmware} is a jb kernel.

Bastler1 said:
I thought that CWM-Based Recovery 6.0.3.2 for Xperia S {Official JB firmware} is a jb kernel.
Click to expand...
Click to collapse
It is.

Ah.
Just reading a lot´s of webpages in the meantime and found another way to get the cwm.
i have downloaded the ROM MANGER Free version in the market. This programm should create cwm recovery i need. - just waiting for a charged battery. tell you soon if it works.

Careful. Those apps are not 100% safe to trust.

You should flash the kernel or recovery using fastboot instead. Its the best way to go about it. Make sure you can connect to your device using fastboot. Would save you a lot of troubles and time in the future.

malcohmx said:
You should flash the kernel or recovery using fastboot instead. Its the best way to go about it. Make sure you can connect to your device using fastboot. Would save you a lot of troubles and time in the future.
Click to expand...
Click to collapse
I did it like this whit the older version v1 in it worked fine. in the rom manager the xperia s is missing - and not necessary
thanks for all hints and advices.

[Q] Trying to install Xperia Play Z final version, very confused. (r800a)

Hey guys, as the post title says, I'm trying to install the xperia play z rom, and I'm hitting a lot of road blocks. First one is, I don't even know if my phone's bootloader is unlocked! I'm pretty sure it is, because I thought all r800a's came with an unlocked bootloader, and I also used the flashtool, unlock bootloader tool, and it said it was already unlocked.
So, naturally what I do, is I flash the firmware in the guide (located here - http://www.android-hilfe.de/root-cu...a-play/417392-rom-xperia-play-z-v1-1-0-a.html), and after that I want to root it so I can install a recovery. But when I try to root it, it always fails on part 1. So I tried to install cyanogenmod recovery without it. But after the apk is installed, i'm not able to install the actual recovery because it is not rooted.
My main problem with the guide is that it says to just boot into clockworkmod recovery, but I don't know how to. I turn on the phone and press the up button, but without installing the CWM/X-parts recovery, there's no way I can expect it to come up.
Any help please? I'm totally lost here. I know how to get roms that are based on gingerbread, but for some reason, Ics/Jellybean roms don't work at all, and I don't know if it is whether because my phones bootloader isn't unlocked (even though it says it is), or it's something else, like me missing a tutorial specifically for ics/jellybean roms.
Thanks in advance.

fishvtt said:
Hey guys, as the post title says, I'm trying to install the xperia play z rom, and I'm hitting a lot of road blocks. First one is, I don't even know if my phone's bootloader is unlocked! I'm pretty sure it is, because I thought all r800a's came with an unlocked bootloader, and I also used the flashtool, unlock bootloader tool, and it said it was already unlocked.
So, naturally what I do, is I flash the firmware in the guide (located here - http://www.android-hilfe.de/root-cu...a-play/417392-rom-xperia-play-z-v1-1-0-a.html), and after that I want to root it so I can install a recovery. But when I try to root it, it always fails on part 1. So I tried to install cyanogenmod recovery without it. But after the apk is installed, i'm not able to install the actual recovery because it is not rooted.
My main problem with the guide is that it says to just boot into clockworkmod recovery, but I don't know how to. I turn on the phone and press the up button, but without installing the CWM/X-parts recovery, there's no way I can expect it to come up.
Any help please? I'm totally lost here. I know how to get roms that are based on gingerbread, but for some reason, Ics/Jellybean roms don't work at all, and I don't know if it is whether because my phones bootloader isn't unlocked (even though it says it is), or it's something else, like me missing a tutorial specifically for ics/jellybean roms.
Thanks in advance.
Click to expand...
Click to collapse
Well you have to flash an ICS kernel first and it will already have a cwm recovery in it. Then you can just boot to recovery and flash the rom
Sent from my Xperia Play (r800x)

abdel12345 said:
Well you have to flash an ICS kernel first and it will already have a cwm recovery in it. Then you can just boot to recovery and flash the rom
Sent from my Xperia Play (r800x)
Click to expand...
Click to collapse
OHHHHHHHHH. Thank you so much. But how am I supposed to flash the boot.img for the modified doomkernel v3, which it says it includes in the guide? Am I supposed to extract it from the rom zip or something? Thanks again.

fishvtt said:
OHHHHHHHHH. Thank you so much. But how am I supposed to flash the boot.img for the modified doomkernel v3, which it says it includes in the guide? Am I supposed to extract it from the rom zip or something? Thanks again.
Click to expand...
Click to collapse
yes, boot.img is inside the zip. Unpack just that file and flash it with flashtool (in fastboot mode). But you must have unlocked bootloader to be able to flash any custom kernel

Bakisha said:
yes, boot.img is inside the zip. Unpack just that file and flash it with flashtool (in fastboot mode). But you must have unlocked bootloader to be able to flash any custom kernel
Click to expand...
Click to collapse
Alright. Thank you so much. So that's what I was missing.

Bakisha said:
yes, boot.img is inside the zip. Unpack just that file and flash it with flashtool (in fastboot mode). But you must have unlocked bootloader to be able to flash any custom kernel
Click to expand...
Click to collapse
Sorry, another question. What happens is that when I try to flash an ics kernel, it goes into an infinite bootloop, but when I flash a gingerbread kernel, it works fine. Is this a sign of a locked bootloader? Cause I thought you wouldn't be able to install any kernels if it was locked.

fishvtt said:
Sorry, another question. What happens is that when I try to flash an ics kernel, it goes into an infinite bootloop, but when I flash a gingerbread kernel, it works fine. Is this a sign of a locked bootloader? Cause I thought you wouldn't be able to install any kernels if it was locked.
Click to expand...
Click to collapse
If you flash ics kernel, you won't be able to boot your old gb rom. Ics kernel only boot into ics rom.
When you flash ics kernel, go to recovery and install ics rom.
Sent from my R800i using xda app-developers app

Bakisha said:
If you flash ics kernel, you won't be able to boot your old gb rom. Ics kernel only boot into ics rom.
When you flash ics kernel, go to recovery and install ics rom.
Sent from my R800i using xda app-developers app
Click to expand...
Click to collapse
Thank you so much. Worked like a charm.
For future readers -
a. The r800a indeed does come with bootloader unlocked
b. It is normal for the phone to bootloop, Just go into recovery like normal and install the rom .zip. (It's usually tapping back while starting the phone, but if that doesn't work, try up volume or down volume)