Where to start? (unlocking bootloader, rooting, custom kernel/rom, etc) - Sony Xperia M4 Aqua

Hello everyone
I have been reading the dev forums gathering info so I can install a fresh, optimized and non-bloated ROM in my wife's M4 aqua, but I'm a little confused about the bootloader/root part.
What is the correct order to follow? First unlock the bootloader, then rooting/install twrp, then flashing a custom rom? What ROM seems to have a better overall performance?
Btw, the phone is the E2303 model I think (the 8 GB one with single sim) with official MM and the service menu says that is possible to unlock the bootloader.
Thanks in advance

Related

[Q] Recovery to use after flashing new ROM

Hi again,
I kind of feel bad for almost only asking questions, but this place has been and continues to be a fantastic resource for learning when my search results turn up dry.
I'm running my Z2 on the generic, international .402 firmware with a locked bootloader, rooted via the easy root tool. I have Nut's PhilZ/TWRP dual-recovery installed, but the rest of the phone is stock.
As explained in this thread, the dual-recovery from Nut works on both locked and unlocked bootloaders, so long as you're using the stock Sony kernel (which is the case here). I'm planning on unlocking my bootloader and flashing either Carbon or CM11 soon, but I don't know what will happen to the recovery: will the dual-recovery no longer work because a new ROM (and new kernel) have been flashed? Will this version of TWRP work in its place?
If anybody has flashed an AOSP ROM onto a Z2 and could provide some insight, it would be a big help. Thanks.
Hi.
All you have to do is flashing NUTs dual recovery right after flashing your custom rom. Then you should keep your dual recovery.
More information could be found in the following thread.
http://forum.xda-developers.com/showthread.php?t=2785598

essential rooting questions (xperia phone noob)

ok guys well im on stock 4.4.4 and i just unlocked the bootloader. Anyway to obtain root or flash custom roms? i have read through both general and question sections but cant pinpoint an answer. i see most roms need unlocked bootloader which is fine and i see there is a dual recovery for locked and unlocked bootloaders but would i just need that and flash that without root and i can start flashing roms? sorry if these questions sound idiotic, i can assure you i am no noob doing these things as i came from the htc m8 and this is my first xperia device and flashing and rooting and unlocking bootloader was definitely a new process slightly with this phone. Again i have already unlocked bootloader which took some time but went through thanks
Or you could flash a custom kernel, doomlords for stock or m5 for cm based via adb then flash the rom you want, obviously if you flash the cm kernel a stock rom won't boot but you'll still be able to access recovery to flash a custom rom
Sent from my Xperia Z2 using Tapatalk

Unlockable bootloader + Custom ROM question

Hey all, first of all I'm not new to the Android world. I've had many phones, and all if them modified heavily. I do not consider myself a Dev (I've made some basic scripts that's about all) but definitely a power user.
Anyway, I'm a little lost on this z2 as far as modding it goes. My bootloader is NOT unlockable according to the phone stats, however I have seen a few root methods for 5.1.1 and locked bootloaders (I'm build a.1.232). Now many of these rooting methods ask for you to downgrade to a rootable version, root it, then reflash a prerooted 5.xx ROM. Easy, However with my unlockable bootloader how will I flash anything other than a stock Sony ROM without bricking it?
Essentially what I'm after is how far can I go with a locked bootloader, and if there is s surefire way to root 5.1.1 without downgrading since I can't flash back up. Also am I good to flash a custom recovery? Or is that offlimits as well being locked. I'm a little lost due to lots of mods here apparently working with locked bootloaders, and on my HTC one that just didn't fly.. Lol.
Thank
AlwaysDroid said:
However with my unlockable bootloader how will I flash anything other than a stock Sony ROM without bricking it?
Click to expand...
Click to collapse
You meant locked bootloader right?
You won't be able to flash any custom ROMs without unlocking your bootloader.
The only custom ROM that works for locked bootloader is MIUI (which uses the stock Sony kernel)and the phone needs to be downgraded to 4.4.4 and there are some custom ROMs out there which may work on locked bootloaders.
Yes,you will be able to flash custom recovery and use mods that are available on XDA and also xposed works fine on LB
You won't be able to flash custom kernel or custom ROM for LB
Yes downgrade is possible

How to know which rom locks the bootloader

Hi, I am new to mi devices had used sony in the past. I wanna ask which custom roms locks the bootloader (No MIUI) ??
I was going through threads of other rom and I can see that some relock the boot loader that's why I am asking . Because in sony the custom roms except for the official firmware didn't lock the bootloader
Would be of great help if somebody could tell me how to find out that which rom locks the bootloader or not without asking in every rom thread and look like a fool noob
any mm rom lock bootloader...so take backup using alka twrp before flashing mm rom

Xperia Z2 Bootloader unlock and camera quality

Hi,
This may have been discussed before, but I couldn't find exactly what I'm looking for.
So I'm asking here.
I've read a long ago that unlocking the bootloader will cause degradation in image quality (due to removing DRM keys etc)
So I've been on stock firmware from the beginning.
But now that sony stopped giving updates, I want to move on to nougat.
So my question is, is there any way to preserve camera image quality while unlocking the bootloader and installing a custom rom such as ressurection N?
I'm on latest official firmware 23.5.A.1.291
rooted and nut's dual recovery installed.
Thanks for taking the time to read my question.
badhon_raj said:
Hi,
This may have been discussed before, but I couldn't find exactly what I'm looking for.
So I'm asking here.
I've read a long ago that unlocking the bootloader will cause degradation in image quality (due to removing DRM keys etc)
So I've been on stock firmware from the beginning.
But now that sony stopped giving updates, I want to move on to nougat.
So my question is, is there any way to preserve camera image quality while unlocking the bootloader and installing a custom rom such as ressurection N?
I'm on latest official firmware 23.5.A.1.291
rooted and nut's dual recovery installed.
Thanks for taking the time to read my question.
Click to expand...
Click to collapse
There is no need of DRM key for aosp rom and the quality of pictures are same as stock
badhon_raj said:
Hi,
This may have been discussed before, but I couldn't find exactly what I'm looking for.
So I'm asking here.
I've read a long ago that unlocking the bootloader will cause degradation in image quality (due to removing DRM keys etc)
So I've been on stock firmware from the beginning.
But now that sony stopped giving updates, I want to move on to nougat.
So my question is, is there any way to preserve camera image quality while unlocking the bootloader and installing a custom rom such as ressurection N?
I'm on latest official firmware 23.5.A.1.291
rooted and nut's dual recovery installed.
Thanks for taking the time to read my question.
Click to expand...
Click to collapse
Before flash any nonstock based rom and unlocking bootloader back up DRM keys and do restore when set up the phone.

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