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[GUIDE] Install custom ROM without computer

Hello everyone. I have come up with a lazy way to install custom ROM (such as Cyanogenmod) in *most* phone (I tried this on S3mini and Galaxy MEGA). Please note that this method moght not work on your phone and I am not responsible for bricking your phone.
Things you need:
-Your phone, fully charged
-Your precious time (About 30-60minutes)
-One click root app (I use Kingroot, download it with apk) (You may use other apps, of course)
-TWRP manager from playstore
-ZIP file of TWRP in latest version (V3?)
-ZIP file of the custom ROM matching the version of your device
-ZIP file of GApps matching the version of the custom ROM (Google for gapps and download it)
Steps:
1. Backup your personal information
Copy your personal information such as music, photo, documents out of your phone (e.g.: Cloud drive, USB, SD card). Safety first.
2. Root your phone
Download Kingroot and install the apk with package installer. Run the app and follow the instruction in the app to root.
3. Install TWRP manager
After rooting, install TWRP manager. In the app, install TWRP that match your device.
4. Create a backup for your phone
Boot your phone into recovery (Every phone have different method, so please google about this). In TWRP, press 'Backup' to create the backup.
5. Flash the latest version of TWRP
As the TWRP manager does not offer the latest version of TWRP, you have to flash the latest version by installing ZIP. The latest version of TWRP can install ROM with higher success rate.
To do this, press 'Install' in TWRP. Find the ZIP file of TWRP in latest version and install it.
6. Reboot your device to Recovery mode
7. Wipe your device
In TWRP, press 'Wipe'. Select Cache, Dalvik Cache, System and Data partition and wipe them.
8. Flash custom ROM
In TWRP, press 'Install'. Select the Custom ROM ZIP and install it.
9. Flash GApps
Most custom ROM does not have Google apps such as play stote, so you have to install it.
In TWRP, press 'Install'. Select the GApps ZIP and install it.
10. Wipe Cache and dalvik cache
In TWRP, press 'Wipe'. Select Cache and Dalvik Cache partition and wipe them.
11. Reboot your device
Now the ROM should be properly installed. First boot might take longer, so please wait patiently.
Shall you brick your phone, try to recover by using backup created in step 4.
PS: I am a newbie here and this is my first guide

While you have to wipe your device to flash the custom rom, it will wipe your data, including the actual Gapps and rom. This shows that your method won't work.

Rooting L29 with srk tool.

Hi guys. I was able to get TWRP on my mate 8 as per you tube instruction and i got as far as getting ready for ADB sideload however the portal then says error: device not found. This is supposed to be the final step before the SuperSu logo appears in my app draw.
I remember on my s4 i had to wipe the dalvik cache. Do i need to do the same here?

ubermorgan said:
Hi guys. I was able to get TWRP on my mate 8 as per you tube instruction and i got as far as getting ready for ADB sideload however the portal then says error: device not found. This is supposed to be the final step before the SuperSu logo appears in my app draw.
I remember on my s4 i had to wipe the dalvik cache. Do i need to do the same here?
Click to expand...
Click to collapse
Root
Step by Step Guide
1.
Download files (supersu_v2.79_sr2.zip)
1.3- http://www.sillanwali.com/downloads/supersu_v2.79_sr2.zip
2-
Copy this file (supersu_v2.79_sr2.zip) into SD Card
3-
Download TWRP Recovery 3.0.2-0
http://sillanwali.com/downloads/twrp-3.0.2-0-next.img
4-
adb devices
adb reboot bootloader
fastboot flash recovery (PATH-TO)\twrp-3.0.2-0-next.img
5-
5.1- Reboot your phone to TWRP then choose Wipe > format > type Yes
5.2- Back again, then wipe (data, dalvik, cache, system)
5.3- Don't reboot after install
6-
Install
6.1- supersu_v2.79_sr2.zip (Don't reboot after install)
7-
Hope rooted
8-

Xiaomi mi4c Android 7 7.2.9 Root and Twrp Easy

Xiaomi mi4c easy root and Twrp install For not found open bootloader !!! My operational guidance :good:
1. Run Twrp Swipe fastory reset install Supersu 2.78 for binary update and Install Android 5.1 miuios rom end Swipe Dalvik / Art Cache Cache and reboot to run the phone and test app from Market Root Checker.
2. Run Twrp Swipe fastory reset and install twrp Android 5.1 Swipe Dalvik / Art Cache Cache and reboot
Run a test phone app Ndr utils
3. unpack Twrp libra for Android 7 image instalation.
4. Swipe Dalvik / Art Cache and Cache and install image twrp for Android 7 and next install Android 7 rom reboot
Google Play install apk official Twrp App and install image Twrp pro Android 7 again
Entry into TWRP over apk Ndr Utils
link Twrp : https://www.androidfilehost.com/?fid=457095661767135741[/url]
link Super su : https://download.chainfire.eu/1003/SuperSU/SR1-SuperSU-v2.78-SR1-20160915123031.zip
Please follow the procedure and you will be surprised

?????

Detail please
I just gotta break it down into the steps I get :
First step:
- go to TWRP and do factory reset
- Flash supersu zip file in the link
- Flash MIUI OS 5.1 and wipe dalvik&cache
- Reboot then check for root with installing root checker app
Second step:
- Go back to TWRP and do another factory reset
- flash TWRP for OS 5.1 zip file and wipe dalvik&cache
- reboot then install NDR Utils and run a test with this app.
Third step:
- unpack the IMG file of the TWRP for OS 7 in the link
Fourth step:
- wipe dalvik&cache then install the unpacked TWRP
- install OS 7 ROM then reboot
- From Google play install TWRP app then install the unpacked TWRP again from the app
- go to TWRP recovery using NDR Utils app
- be surprised
I got few questions, just to figure out where is the magic :
1. Which ROM version do we start from ?
2. What if we already got root? Skip to second step? I use MIUI8 6.12.22 MS and it already have root. And play store.
3. Why we have to flash the TWRP OS 5.1? I mean it already what we use.
4. What test to run with NDR Utils? It seems that it only works with TWRP XZDR recovery (I don't know what it is)
5. What is the OS 7 ROM we can flash? Is it the update version? And what for? To retain root? What if the update got no root? TWRP app need root to flash the IMG file, if the OS 7 ROM got no root then we're finished.
6. What if we just:
-Flash TWRP OS 7
-Flash OS 7 ROM with root
-Flash TWRP OS 7 again
-reboot, install TWRP app, flash the OS 7 IMG
Will it give the same result?

??????
your CAPTION Xiaomi mi4c Android 7 7.2.9
.
Your STEP Instal MIUOS 5.1
.
WHAT THE MEAN....??????????????????????????????????????????????????

[Guide] Step by Step Installation of Android Pie Custom Roms

Step by Step Installation of/Upgrade to Android Pie Custom Roms
Following this guide, you will lose all your data if haven't backed it up yet!!
Also NO USING GSI PIE!!!
Requirements:
- Twrp is already installed.
What you need:
- LineageosTWRP (Attached to thread)
- Custom Rom (can be found here)
- Open Gapps (Pico or Nano)
Only if Root is wanted: Chose either of them
Magisk(Recommended) or SuperSU
- A brain and a body
- The Knowledge that you will wipe your phone by doing this. Be Warned.
Installation:
1. Backup all the files that you have either by copying them to a usb drive ,a micro SD or your computer.
2. Check that all files are copied successfully and can be opened or viewed.
( Some apps have a cloud synchonisation feature, use it if you have it as an option since it is really helpful!)
3. Now, get your preferred rom, gapps and if wanted, your root method ready, also unzip the twrp file aswell.
Copy them to your micro SD.
4. Boot into twrp via adb or by using some app(root needed).
In Twrp, go into wipe option, then select change file system. Change file System to ext4.
4.1 Now use Twrp Reboot-Menu Option to reboot into recovery(twrp) again.
4.2 Wipe system, data, cache and dalvik-cache partitions using the Wipe option
5. Go into Install Option and Press on "Install IMG" , select pietwrp image and flash it. (The name should be lineagerecovery.img or something if downloaded via telegram)
(If you don't have it yet and are in the Lenovo P2 Telegram group, type #pietwrp in chat and make sure to safe it to your download folder. Otherwise it's also attached to this thread.)
6. Reboot back to recovery like you did in step 4.1.
7. Now install your rom and gapps.
8. Wipe cache and then reboot .
9. Setup your phone and Enjoy.
( For Root, reboot to recovery. Flash your Root Method, wipe cache and reboot)
Enjoy and thank your Devs
FAQ
Q: Instructions unclear, phone stuck in bootloop
A: Either do this:
Download this folder and use one of the two ".bat" files. Boot into Bootloader via Volume Down and Power Button. --
It will flash S048 Firmware of our Lenovo P2, after the flash-process is finished it will boot up on its own. Recommended: Do all the ota updates via ota app.
Or: Boot into bootloader, via adb cmd prompt use: fastboot boot lineagerecovery.img , then use reboot menu to reboot into twrp. Clean Wipe phone(Wipe system,data, cache and dalvik-cache Partitions) and try flashing your Rom etc. again.
Q: Instructions unclear, hardbricked my phone!!
A: Thaat shouldn't have happened. Did you screw up somewhere?...
Luckily you backed up your most important files!

OP7Pro not recognized by Windows in FastBoot mode

Phone OS: OxygenOS 11 EU
PC OS: Windows 11 x64
I'm trying to unlock the bootloader so that I could debloat my phone, install some magisk modules, and GCam.
While ADB normally sees my phone without issues, it's not recognized in Fastboot mode. In the Devices Manager window, the phone is shown as a generic Android device with the yellow warning sign (only during Fastboot, correctly detected as OP7Pro otherwise).
I tried installing ADB from multiple sources, and even used mauronofrio's Tool All In One to no avail. The guides to unlock bootloader don't make any mentions of this issue, and online I've only managed to find very old unsolved threads for other phones.

So, your system doesn't recognize the phone in fastboot mode ?
Did you tried to uninstall the device in the device manager, then plug it back ?

draentor said:
So, your system doesn't recognize the phone in fastboot mode ?
Did you tried to uninstall the device in the device manager, then plug it back ?
Click to expand...
Click to collapse
Good news, not sure why but today it was recognized, and installing TWRP and Magisk seemed to go smoothly.
I now have another question: this post (from 2019) mentions that I should've not installed Magisk the way I did.
I did the following:
1. unlock bootloader via Tool All In One
2. update OxygenOS via the notification I received, then reboot
3. install TWRP via Tool All In One
4. install Magisk via the TWRP menu and app (using the recommended choice)
What instead the guide says is: after TWRP and Magisk installed, update without rebooting, then install TWRP A/B Retention Script, then install Magisk to Inactive Slot and not the recommended Direct Install.
Could I have issues of any kinds, maybe update related, with these premises? If yes, what can I do to fix them?

Nevermind, phone's dead now. I will open another thread about it.

I think this guide is outdated.
That's what worked for me (Read everything before beginning) :
Unlock the bootloader
Update to the last OxygenOS version
Use Oxygen Updater app to be really up-to-date
Install TWRP
To do so, get the latest TWRP .img file here : https://twrp.me/oneplus/oneplus7pro.html
Get the latest twrp-installer.zip file too
It's ready for Android 11, maybe Android 12, I didn't tried
Don't forget to check "Developer options" in system settings
With your phone plugged in your computer, use adb commands and reboot to fastboot with "adb reboot bootloader"
Then, load TWRP with "fastboot boot twrp.img". Of course, you need to put the latest TWRP image file previously downloaded in the same folder and rename it "twrp.img"
In TWRP, go to Advanced then press "Flash Current TWRP"
Done !
Then, follow those instructions :
Wipe -> Factory Reset + : Wipe Data, System, Cache and Dalvik Cache
Install -> Flash ROM : Use the install function and install the ROM
Install -> Flash TWRP Installer : Don't reboot, go back and install as the previous step
Reboot -> Recovery : Reboot TWRP and it automatically load the other slot
Wipe -> Format Data : Click and type yes
Reboot -> System : Just reboot and it should load the installed ROM
Reboot to recovery
Install -> Magisk
Reboot -> System
Install -> Whathever you want
Reboot -> System

draentor said:
I think this guide is outdated.
That's what worked for me (Read everything before beginning) :
Unlock the bootloader
Update to the last OxygenOS version
Use Oxygen Updater app to be really up-to-date
Install TWRP
To do so, get the latest TWRP .img file here : https://twrp.me/oneplus/oneplus7pro.html
Get the latest twrp-installer.zip file too
It's ready for Android 11, maybe Android 12, I didn't tried
Don't forget to check "Developer options" in system settings
With your phone plugged in your computer, use adb commands and reboot to fastboot with "adb reboot bootloader"
Then, load TWRP with "fastboot boot twrp.img". Of course, you need to put the latest TWRP image file previously downloaded in the same folder and rename it "twrp.img"
In TWRP, go to Advanced then press "Flash Current TWRP"
Done !
Then, follow those instructions :
Wipe -> Factory Reset + : Wipe Data, System, Cache and Dalvik Cache
Install -> Flash ROM : Use the install function and install the ROM
Install -> Flash TWRP Installer : Don't reboot, go back and install as the previous step
Reboot -> Recovery : Reboot TWRP and it automatically load the other slot
Wipe -> Format Data : Click and type yes
Reboot -> System : Just reboot and it should load the installed ROM
Reboot to recovery
Install -> Magisk
Reboot -> System
Install -> Whathever you want
Reboot -> System
Click to expand...
Click to collapse
Thanks, I'll save it for next time. Unfortunately the phone's dead and I'm not sure how I got there, nor how or if I can recover it. I made a thread here https://forum.xda-developers.com/t/op7pro-dead-black-screen-wont-turn-on.4387537/