Database Users

Newbie guide for installing a Custom ROM in SGP312 Sony Xperia Tablet Z

The objective of this post is to explain how to currently install a custom ROM in our device. (for total newbies like me, you can also refer -among others- to my previous post). I give the general procedure which wipes everything in your device, but you can check various precious posts in xda that variate this procedure.
The codename for our device is "pollux_windy", which is the Wifi-only version. The LTE version (I should probably get the LTE!) is "pollux" and I suppose the general procedure (with the corresponding firmwares to your specific device) will work for any Xperia device. You can also get the general idea from this post.
As a general rule of thumb do not forget after/before every firmware flashing to:
Enable developer mode (explained here)
Enable the USB Debugging mode (explained here)
Trust installation from unknown sources (explained here)
Steps.
A. Unlock the bootloader.
You can refer here and then check that it is successfully unlocked with these steps (taken from here ):
Open the Contacts app.
Click the menu button.
Click Settings.
Long press (for about 5 seconds) somewhere in the empty space just above status bar, as indicated by the red frame in the screenshot below, and then release your finger. A button named Enter service code will then appear in the same area (this may take a few tries).
Click Enter service code. A dialler will appear.
Dial *#*#7378423#*#* . Then go to -> "Service Info" -> "Configuration". If there is:
Bootloader unlock allowed - Yes << this means that your Bootloader is Locked
Bootloader Unlocked - Yes << this means that your bootloader is unlocked
B. Flash a firmware in which you will root the device
Download/install FlashTool.
Download and place to the FlashTool's folder "firmwares" the firmware "SGP312_10.5.A.0.230_VMo UK_IE.ftf". More information here . In sort, download and extract http://d-h.st/MrI and http://d-h.st/ULc
Open FlashTool and connect the powered-off device (USB cable) in Flashmode, holding the Volume Down button while you plugin the usb cable. The FlashTool should say that it is connected in Flashmode. Then flash the 10.5.A.0.230 firmware in it.
C. Gain root to the new firmware
Open the device, complete the setup wizard and connect to a wireless network. You do not have to setup the Google Account since you can download every application googling the respective APK files, but Google Play is easier to use.
Get (click λ) the towelroot APK, install it and run it (click "make it rain"). You should have root, which you can check with a Root Cheker like this one.
Download/Install SuperSU APK (this is actively developed, while SuperUser is abandoned at the moment) as described here.
D. Install a Recovery to easily flash new ROMs
NUT has done excellent work with XZDualRecovery.Follow the instructions for installing it in his thread. In short:
Download the installer, run it and follow its instructions.
Select SuperSU and of course grant access to your computer from your tablet (watch the tablet screen).
E. Download a Custom ROM and Google Apps
I had problems with Cyanogenmod (versions 11 and 12) that I cannot explain. I had no GPS and no media sound from the speakers, but I did have "notifications" sound! I could listen to "media" sounds using headphones, though. So I tried the nightly OmniROM which seems very stable and fast at the moment, with no sound problems and also has a working GPS! You can get it directly from their site (the NIGHTLY I downloaded is omni-4.4.4-20150223-pollux_windy-NIGHTLY.zip which runs just fine). Somewhere I read that PacMan ROM - also works perfectly but I have not tested it yet.
I had device recognition problems from the Recoveries ("Status 7 Error") that I think dear NUT will solve promptly. What I did to solve them is
Upack the ROM zip.
Remove the first line (from assert(...); till the column) of META_INF/com/google/android/updater-script and save the file.
repack the ROM to a zip.
Then copy this zip to your external SD card. If you need google apps (you probably do, to use Google Play instead of other applications like Aptoide), you will also need to download and place to your external SD card the corresponding google apps from here - (I found it in this post - which also explains the different gapps versions)
F. Install the Custom ROM
So now that both the ROM and (optionally) gapps are in the device's SD card:
Enter the Recovery while repeatedly pressing Volume Up or Down while the device boots.
Wipe everything (except the external SD card, obviously --- if you delete the zip files by mistake you must begin again from step B. using the FlashTool to flash the *.230* ftf).
Reboot and setup/enjoy your new ROM.
It seemed that with OmniROM I had lost root access so I had to reinstall SuperSU. I did this by downloading the flashable/installable zip - and flashing/installing it through the recovery.
In the end a did a full backup with the TWRP recovery and one with Titanium backup

Magnus_E said:
The objective of this post is to explain how to currently install a custom ROM in our device. (for total newbies like me, you can also refer -among others- to my previous post). I give the general procedure which wipes everything in your device, but you can check various precious posts in xda that variate this procedure.
Click to expand...
Click to collapse
For installing customs (CM/AOSP/GPe based ROM's), you don't need to install .230 firmware, furthermore you don't need root (except for backup TA procedure), furthermore you don't need XZDualRecovery (cause it works only for Stock and Custom STOCK based rom's - see this post).
So you you only need to flash kernel via fastboot, and then enter recovery (integrated in kernel), and install .zip with custom, SuperSU and Gapps from there.

hello i was following this guide but im stuck on status 7 error, i tried deleting assert but the twrp recovery dont get any answer to "getprop ro.product.device" and it just doesnt proceed...
and Rootk1t i cant find any kernels flashable via fastboot or flashtool can you point one to me? all of the kernels i see are in '.zip's .... i want to have android 6.0 so i think i should have black kernel but how?

bluealef said:
hello i was following this guide but im stuck on status 7 error, i tried deleting assert but the twrp recovery dont get any answer to "getprop ro.product.device" and it just doesnt proceed...
and Rootk1t i cant find any kernels flashable via fastboot or flashtool can you point one to me? all of the kernels i see are in '.zip's .... i want to have android 6.0 so i think i should have black kernel but how?
Click to expand...
Click to collapse
.zips are installed through recovery, .ftf through flashtool.
6.0.1 ROM you can find here.

Easy Z3 GUIDE: Root, Recovery, Unlock bootloader, Flash rom

After several hours last night comparing tons of guides to find the fastest, easiest and newest guides this is a summary of what i came up with. (No need to downgrade or mess around with a bunch of complicated steps). Tested on Z3 D6603, Firmware 23.1.A.28.
Rooting
I used these guides, but they both had outdated apps.
From XDA: http://forum.xda-developers.com/xperia-z2/general/root-t3108230
Better grafical guide: http://www.whattechsays.com/android/root-xperia-z2-z3-lollipop/
Links to the updated apps:
KingRoot: http://androidxda.com/download-kingroot-application
MOD EDIT by @gregbradley
Also, users should be aware that Kingo root sends your IMEI to an unknown IP address in china during the root process, you have been warned. For more information read the whole OP here
Busybox: https://play.google.com/store/apps/details?id=stericson.busybox&hl=en
XZRecovery: https://www.androidfilehost.com/?fid=95916177934556263
SuperSU: https://play.google.com/store/apps/details?id=eu.chainfire.supersu&hl=en
Troubleshooting
XZRecovery didnt work for me so i had to use another guide to install TWRP dual recovery.
http://techtrickz.com/how-to/install-twrp-recovery-xperia-z3-locked-bootloader/ ...software: http://nut.xperia-files.com/ (choose the newest XZDualRecovery version and then choose the Z3 installer )
The standard version of SuperSU didnt work but the newest beta version did work
http://forum.xda-developers.com/apps/supersu/2014-09-02-supersu-v2-05-t2868133
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Unlock bootloader
Best and straightforward guide: http://www.android.gs/unlock-bootloader-sony-xperia-devices-universal-tutorial/
Command promt
Guide for using the command promt http://www.7tutorials.com/command-prompt-how-use-basic-commands (if you wanna go directly to one folder in the command promt: navigate to the folder, press shift + right click and choose open command window here)
Troubleshooting
I had a problem to get into fastboot mode, heres alternative ways
http://www.theandroidsoul.com/boot-sony-xperia-z3-fastboot-mode-63226/
Drivers. I then had a problem with the drivers in Windows 10.
Windows didnt let me install my own drivers, only the drivers that it recommended. Heres how to byepass that and install unsigned drivers. http://club.myce.com/f189/how-disable-driver-signature-enforcement-command-line-338073/
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Flash ROM
Theres a guide on how to flash rom inside this popular official rom.
http://forum.xda-developers.com/z3/development/rom-blisspop-team-bliss-2-2-z3-t3064669
Then most popular Z3 rom:
http://forum.xda-developers.com/z3/development/rom-cyanogenmod-12-nightlies-xperia-z3-t3010201
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Thanks everyone for your time and work creating these amazing apps and guides!
Making it possible for us noobs to enjoy a great mobile experience.

Guide to flash Nougat if you face bootloops when upgrading

Hey guys!
This is just a simple post for you guys who want to make the jump to Nougat on the Snapdragon version of the Redmi Note 3, but face issues like bootloop or soft brick .
I tried many times to flash to Nougat and failed, so I thought I would document my experience for anyone who needs it.
The main problem I faced was an outdated bootloader.
Here, I have detailed the steps I took to flash Nougat successfully on my phone.
This does assume that you do have some experience and knowledge about the world of custom ROMs.
- disclaimer -
I am not responsible for any damage you may cause as a result of following this guide.
I am not affliated with any of the authors that wrote the guides that I will link in this guide.
The links are there purely for reference, and if you wrote one of the posts that I have linked in this guide, please message me to have your name at the bottom of this post.
- disclaimer end -
Here are a few things to note.
1) The version of MIUI you were on when you unlocked your bootloader.
2) Whether or not you have uploaded your bootloader
3) Whether you unlocked your bootloader officially
4) Whether you have permission to unlock the bootloader from XiaoMi.
5) Download and install the latest version of MiFlash
6) Download and install ADB and Fastboot on your PC
7) Boot into download mode to check if your PC recognises your phone. If not, reinstall the appropriate drivers.
A few websites you might want to refer to :
A MIUI forum page which teaches you how to flash/unbrick your Redmi Note 3.
http://en.miui.com/thread-235865-1-1.html
A MIUI forum page that teaches you how to repair your IMEI if it gets corrupted
http://en.miui.com/thread-245598-1-1.html
A guide to the XiaoMi deep flash cable as a kind of last resort(This is essentially Xiaomi's version of Samsung's USB jig; to force your device into download mode)
http://forum.xda-developers.com/redmi-note-3/how-to/guide-how-to-flash-hard-bricked-redmi-t3490055
First, you may want to do a few things.
1) Check and double check your device codename (Kenzo for Redmi note 3 Pro, Kate for Redmi Note 3 SE)
2) Download the latest Global Developer ROM (There are .zip and .tar versions, for this guide we will be using the latter. I get my ROMs from here : http://en.miui.com/a-234.html )
After downloading it, decompress it until you see the file extension .tgz, then unzip it once more. At the end you should have one folder which contains some files and a folder called images.
3) Research and download the ROM and custom kernel of your choice
4) Check up and research anything you are unfamiliar with ( This is a great place to start : http://forum.xda-developers.com/redmi-note-3/how-to/guide-redmi-note-3-available-twrps-t3406708 )
So, to flash the ROM, you can follow these steps. Do note that these steps worked for me at the time of writing and may not necessarily work for you.
1) Backup your stuff (Pictures, chats, contacts, etc.)
2) Go to developer options and check enable OEM unlock and ADB.
3) Reboot into bootloader.(adb reboot bootloader / vol- + pwr from power off state)
4) Use MiFlash to flash the global developer ROM you downloaded.
5) Use the MiUnlock tool to unlock your device.
6) Reboot to MIUI. (If you don't, you might face problems with TWRP demanding for password)
7) Boot to download mode again.
8) Install TWRP recovery.
9) You can now make a nandroid backup. Also make a backup of your EFS partition and keep it somewhere safe.
This assumes that you flashed the latest global developer ROM.
10) You can now flash the ROM and GApps.
11) If you want to install a custom kernel, finish setting up the phone before flashing one.
12) You can install Viper4Arise now if you want.

twrp Porter/Maker for Mediatek MT67XX 64bit & new 32bit Phone

twrp Porter-
as we know there is no tool available to port twrp for mt67XX. Phone so here i create a Simple and user friendly tool to Manually Port twrp for the Mediatek MT67XX Phone also Work with MT65XX new 32 bit phone .
The tool is Not based on Source This is a manually Porting Method where we use Stock Recovery to Port a custom Recovery. i have Port twrp for almost all latest MT67XX Chip from source and you can use as a Port Recovery,[Link below]..
What you need
1. tool Download Here https://androidfilehost.com/?fid=962021903579481564
2. Stock recovery [dump using SP tool or using Miracle box] Rename it 'stock.img'
3. Ported twrp from same chip [ Here is My collection- https://www.androidfilehost.com/?w=files&flid=220042] select according your chip if not work try from other phone. rename it 'port.img'
Note- i have Not enable auto copy to keep work with all chip Manually copy Paste Require.
Instructions-
Place port.img and stock.img in tool folder
Run twrp Kitchen.exe and follow on screen instructions
Donation-
You can Donate Me http://paypal.me/droiddeveloper
Faq-
1. Touch Not Work-
it's due to kernel source try to port from other twrp,
final solution use OTG or compile from source.
2. unable to mount partition's-
check and fix fastab in ramdisk folder before hiting enter.
3,. is this Work on old MT65XX Phone-
yes you can use it for MT65XX phone.
4. is This Method work 100% on all Phone-
No it can't work 100% on all phone but work on up to 90% of Mediatek Phone.
5. is this Support Nougat and oreo Images-
yes this one Support oreo and Nougat Recovery Images.
XDA:DevDB Information
twrp porter , Tool/Utility for all devices (see above for details)
Contributors
XN Logos
Version Information
Status: Beta
Current Beta Version: 1.0
Beta Release Date: 2017-09-30
Created 2017-10-01
Last Updated 2018-01-06

@XN Logos
Thanks for the tool.
I cannot download the recovery
MT6757 6.0 MM.rar
MT6757 Nougat helio P25 6GB RAM.zip
MT6797 Helio X27 6.0MM.rar

you can download from androidfilhost.
here is twrp for ulefone t1 ported using this tool base umi plus e. Helio p25, this tool not work on umidigi crystal 4GB/64GB i have tried but not success. https://androidfilehost.com/?fid=673368273298987398

Thank u for your great job, i think the recovery we obtain is called "image-new.img" (and not "recovery-new.img" as it's mentioned in the screen instruction). I successfully get this recovery but don't know how to flash it ( because my phone is locked and not rooted "LENOVO C2- k10a40-" ( MT6735 ). HELP PLZ and thanks again .

walid77dz said:
Thank u for your great job, i think the recovery we obtain is called "image-new.img" (and not "recovery-new.img" as it's mentioned in the screen instruction). I successfully get this recovery but don't know how to flash it ( because my phone is locked and not rooted "LENOVO C2- k10a40-" ( MT6735 ). HELP PLZ and thanks again .
Click to expand...
Click to collapse
You can flash it using SP flash tools, take scatter file from your ROM and then flash with SP tools...
Here is Fastboot Guide, but you can face adbd and large image error with fastboot.
Code:
fastboot oem unlock
fastboot flash recovery recovery-new.img

Please, help me to find usb vcom drivers for my device : LENOVO C2, k10a40, MT6735. Thank u again

walid77dz said:
Please, help me to find usb vcom drivers for my device : LENOVO C2, k10a40, MT6735. Thank u again
Click to expand...
Click to collapse
I beleive that any question not related to TWRP porter is OT here. Check driver v. 5.1632.
mod edit - needrom links removed not allowed due to registration required in order to download

Here is all Flash tools and drivers-
https://androidfilehost.com/?w=files&flid=216849

XN Logos said:
Here is all Flash tools and drivers-
https://androidfilehost.com/?w=files&flid=216849
Click to expand...
Click to collapse
You can get all news about Mediatek driver and tools (like Flashtool) here:
http://www.androidiani.com/forum/mo...l-flash-di-telefoni-con-chipset-mediatek.html
The latest driver (ADB + Preloader) is 5.1632 (the link that I posted), and is good fro XP up to Windows 10 and didn't rqeuire to disable driver sign.
The latest version for Flashtool (for Windows and Linux) is 5.1728
In the link that I posted are available Gogle Platform Tools (adb.exe/fastboot.exe) usefull for flash boot or recovery without using Flashtool.

base added for Helio X23 [Rename rk.bak to recovery.img]
https://androidfilehost.com/?fid=745849072291678959

Hi
great tool for mtk user y have à mt6797M ( elephone s7 4G )
if I understand correctly I need the recovery stock (I have) and a port recovery ( don't have ) but there are none in the link you give., I tried with MT6797 + helio + x25 + 6.0 but I have a MT6797M with android 7, I'm not sure try to flash .
is it possible for you to make a port of the MT6797M Helio X20 M ?
And my fil name: image-new.img not recovery-new.img it's normal ?

Thinking i got same request as Bradco but MT6753M chip Cubot Cheetah 2
I was not able to find the "1st kernel file", guessing it is xx.img-zImage file.
Here my device nougat stock recovery (or at page 4 device review)
With my device at the moment TWRP seems to work only on Marshmallow. It would be nice if someone like to share an updated recovery
BTW
It took me a few retries to check extracting recoveries requiers 3 or 4 times press enter instead of just a singel press any key

@toBsucht Psp @Bradco we have twrp for both Phone 1. Elephone S7 and 2.cubot cheetah 2 no need to Port again. search Forum..

XN Logos said:
@toBsucht Psp @Bradco we have twrp for both Phone 1. Elephone S7 and 2.cubot cheetah 2 no need to Port again. search Forum..
Click to expand...
Click to collapse
yes there is this twrp: TWRP 3.0.3 by Jemmini (I have it) available on needrom and xda
it works with android 6 without problem but not with android 7.
This TWRP 3.0.3 by Jemmini is based on rom: S7_4g_20170110092009_v1.9.zip which is a rom android 6: https://bbs.elephone.hk/thread-12895-1-1.html#.WdiBplu0OM
My rom got this one: s7_4g_20170814163417_v2.4.zip which android 7 v2.4
I tried this :
1. clean install the rom: s7_4g_20170814163417_v2.4.zip
2. start the phone
3. flash the twrp : TWRP_303_Elephone_S7_4g_v1.9
4. reboot the phone but it is blocking on the logo ( I access the recovery but can not start the phone )
5. y tried 2/3 times but once the recovery install it remains on the logo.
after searching I found only this recovery TWRP_303_Elephone_S7_4g_v1.9
I do not know if there is an update because all DROPbox links are down.

@Bradco
Please read carefully the object of this thread. It's only about TWRP porter.
Is not a thread of support for mod recovery about specific devices.
For this please post in the specific thread for the device. Thanks.
@XN Logos
I propose to add this as first object of firs post
- Scope of this thread
Scope of this thread is only to discuss about TWRP porter application.
Please don't discuss about support for recovery for specific devices.
For this please post in the specific thread for the devices.

bovirus said:
@Bradco
Please read carefully the object of this thread. It's only about TWRP porter.
Is not a thread of support for mod recovery about specific devices.
For this please post in the specific thread for the device. Thanks.
@XN Logos
I propose to add this as first object of firs post
- Scope of this thread
Scope of this thread is only to discuss about TWRP porter application.
Please don't discuss about support for recovery for specific devices.
For this please post in the specific thread for the devices.
Click to expand...
Click to collapse
yes sorry,
I explain just my situation, the subject of my post is well on the port of TWRP for processor MT6797M and not on elephone s7. I must speak well of the phone to explain the problem correctly.
Ps : y test this tuto : https://forum.xda-developers.com/showthread.php?p=32965365#post32965365
but y don't find the file BoardConfig.mk

Pretty much same here!
i took a look to default.prop it use a string:
ro.build.version.sdk=24 (stock v14 recovery)
ro.build.version.sdk=23 ( twrp recovery)
even more that needs to be updated in default.prop file from old TWRP to enable it on API24 i.g.
ro.build.fingerprint (seems to be a littel more work)
i stopped repacking TWRP since i note bad image maybe brick my phone.
Also someone told me marshmallow uses ID_creation code = MOB30J; Nougat uses ID_creation code = NHG47N .... idk
funny i removed a additioinal password request. Another user now got additional :highfive: and idk how it occur

Yes Guys, This thread is only for tool Not for Specific Device. So you can ask only for Port base [MT67XX] not for twrp. if you need twrp You can contact Me or create yourself using tool.

XN Logos said:
Yes Guys, This thread is only for tool Not for Specific Device. So you can ask only for Port base [MT67XX] not for twrp. if you need twrp You can contact Me or create yourself using tool.
Click to expand...
Click to collapse
ok I understand, I want to try to do it myself, can you make a port of MTK 6797M ?
( this is what I needed at the start, I came on this thread to do the twrp myself.
thank you in advance

As already written it is not that easy to use if some errors occur. Also i did not 100% on it which files i have to remove if tool say "delete following":
1. kernel (is it x.img-zImage?)
2. kernel offset (i guess i found)
and that flase "press ANY key" message! Just as a little sidenote for your update.

Newb needs help rooting, unlocking Bootloader and getting a Custom ROM for ALE-L21

Hey there,
I need help, hope you have some for me . I want to use the 6.0.1. OpenKirin OmniROM on my phone and struggle even figuring out a way to get there.
I just bought a used ALE-L21 DualSIM phone with the B602 Build and EMUI 4.0.3 installed. The device is not rooted, nor has its bootloader been unlocked. The EMUI update service does not offer me any patches.
Could someone please line out to me which steps I have to take in order to root my ALE-L21 and get this ROM to work?
Disclaimer: No, I'm not just a lazy moron who does not want to read other topics on this forum - I'm a mere user with less-than-average knowledge of Android development or stuff like that. And I just can't make complete sense of the various posts I've found, since English is not my mother tongue and there seems to be a whole bunch of ways to do certain things with a phone. Well, since obviously I don't want to brick my new phone, I'm not too sure how to best puzzle together the pieces this Forum offers me. It would be insanely helpful if I could get a list that reads out something like:
1. Action - Source (for needed files, e.g.) - Result, on to step 2
2. Action - Source (for needed files, e.g.) - Result, on to step 3
3. ... and so on...
Okay, just so you see that I'm not entirely lost, I'm gonna show you the picture which is currently in my mind.
From what I understand so far, there's the following steps to get there (please rectify or rearrange steps as far as needed):
1. Update the device to Vanilla EMUI 4.1, Build B895 or B896 (I am currently downloading the B896 Build from this forum - which one is recommended? My phone is DualSIM)
2. Unlock Bootloader (What's the best way to do it? Huawei CS? Heard it's not even sure you get an answer. DCUnlocker? Wants money... Please help me clarify)
3. get TWRP 3.1.1.0 (I already have the IMG file, how do I get it to run on my phone?)
4. Root the device (I'd like to go with MAGISK, does anyone have a link for a MAGISK build confirmedly working on ALE-L21?)
5. Do some magic with TWRP (Which steps exactly?)
6. Flash the ROM Zip file via TWRP
7. Flash Gapps via TWRP
Is that about it?
As I said, please feel free to add to/adjust my list!
Thanks in advance,
Pako

If you haven't already install minimal adb tools on computer (windows) found here :
http://bit.ly/2jxX4ya
You then need to unlock bootloader using minimal adb tools and the unlock code
Unlock Code:
http://bit.ly/2z9EFhV
Unlock Bootloader Method in this thread here:
http://bit.ly/2oIASBs
After you are done unlocking the bootloader
Install twrp find that here :
http://bit.ly/2ok9BTi
There was a tool that was here somewhere to install twrp but I will link to my copy here
http://bit.ly/2ATBgRP
What you do is put the twrp image file in data folder
then change the name of the twrp file to TWRP_3.1.1-0_ALICE.img or
edit the install.bat file line data\fastboot.exe flash recovery data\TWRP_3.1.1-0_ALICE.img to the name of your twrp file
Once twrp is installed then you can pick which rom you want
The 6.0 roms arent going to be supported anymore so i suggest going for 7.0 ROM
I'm on AOSPA which is the cleanest and has good battery life
To install 7.0 rom you need B895 or B896 found here on the first post:
http://bit.ly/2jypIij
this is installed through twrp (which is accessed when Phone is off by holding volume up + power then let go once it vibrates or connect the phone to the computer and then type adb devices then adb reboot recovery in minimal adb tool)
once in twrp you need to install the B895.zip or B896.zip file then reboot your phone will boot into emui
you need to install twrp again as B895 or B896 wipes it
After installing twrp you can then install any custom rom of your choice
let the rom boot and then go back into twrp and install gapps found here: "http://bit.ly/1JOWjUqi recommend nano or even pico pick am64 7.1
I would also recommend installing Galactic forced deepsleep http://bit.ly/2ANVdbS

Hey there,
thank you very, very much for your comprehensive walkthrough! (Almost*) everything worked to perfection and I am now a happy user of OpenKirin's OmniROM 6.0.3. mod! Yeah, no 7.x... but I'd prefer to wait with that until the "issues" section of AOSPA does not contain any relevant things anymore. OmniROM seems to have no issues anymore, so I'm content with my choice. I will now follow your last advice and flash the Deep Sleep Mod to improve my device's battery life, and then I'm just happy.
* = The only issue I encountered was when having flashed TWRP, the device booted to the crappy EMUI eRecovery instead of TWRP. I solved this issue using this advice from another thread.
So, once again, thank you! All you xdaDevs, keep on developing ways to improve people's lives with their android devices!
Cheers,
Pako