[Galaxy S II Q&A, Help & Troubleshooting] djibe89:
[Guide] Samsung Galaxy S2 i9100 Android 7.1 Nougat/Lineage OS 14.1

[Guide/Tutorial/Howto] Samsung Galaxy S2 i9100 Any version to Android 7.1 Nougat without PC

This detailed step-by-step guide helps you transform your Samsung Galaxy S2 i-9100/i-9100P to a powerful one with Android 7.1 Nougat.

Verify your phone is i9100 or i9100P before going further : when you Power on phone, it is written Galaxy SII i9100.

The flashing of recovery is a bit tricky but none of the S2 I had were recognised by the PC. So this tutorial is PC free.

If your S2 is recognised by PC, it's easier to flash directly TWRP recovery using Odin or Heimdall https://xdaforums.com/showpost.php?p=75002977&postcount=343

CHANGELOG OF TUTORIAL

v10. Updated pack with TWRP 3.3.1-0

v9. Updated to Unofficial LOS 14.1

v8. Removed Dorimanx kernel (not maintained)

v7. Added Google Play certification (use instructions with my v5 pack below)

v6. Switched to Dorimanx kernel, swteaks, enhenced tutorial thx to feedback, introduced md5 signatures, Stweaks included

v5. Overclock and optimize

v4. Simpler repit, 2 profiles for repit included

v3.5. More custom partitions, kernel for Android N 1.3

v3. Moved to Lineage OS 14.1, Skyline custom kernel, TWRP 3.1 by the.gangster

v2. Added latest repit, added walkthrough for possible errors

v1. Initial release

1 ) DOWNLOAD ---------------------

- djibe Galaxy S2 i9100 pack (53 MB) v5 : http://bit.ly/GalaxyS2djibepackv5

(contains Philz Touch recovery + kernel Lanchon IsoRec CM13 + the.gangster IsoRec TWRP 3.3.1-0 recovery + lanchon repit djibe edit standard or prefered + Su for LOS 14.1 + Samsung drivers).

- ROM Unofficial Lineage OS 14.1 for GalaxyS2 i9100 : https://androidfilehost.com/?w=files&flid=302540&sort_by=date&sort_dir=DESC

Or AOKP : https://xdaforums.com/galaxy-s2/development-derivatives/rom-aokp-rom-t3606915

- OpenGApps ARM 7.1 pico (alternatives: Pico, Micro) : https://opengapps.org/?arch=arm&api=7.1&variant=pico

- a microSD card. Copy Philz Touch recovery + kernel Lanchon IsoRec CM13 + the.gangster IsoRec TWRP 3.3.1-0 recovery + lanchon repit djibe edit standard or prefered + Su for LOS 14.1 AND THEIR RESPECTIVE md5 files from my pack on microSD card and insert it in phone.

- Charge phone to 100 %

WARNING. Read carefully the sentences starting with ###.

### It will not work if your phone is encrypted. Uncrypt it before starting this tutorial.

### This tutorial works without a PC. So it will work if (like me) you get "Unknown USB device error" message when plugging phone in Windows.

### Warranty is now void.

### Later in this tutorial, if you get error : "Failed to mount */data* (No such device)", just reformat Data partition to Ext4 (Using lanchon-repit's script or TWRP recovery).

2 ) BACKUP DATA -------------------

Install Samsung drivers (you unzipped earlier).

Then plug phone to PC in File transfer mode.

Collect all .jpg or .mp4

Use an app like Backupyourmobile to backup texts, contacts, etc.

Check that backup is located on microSD card.

Then copy the backup on your PC.

3 ) FLASH RECOVERY, KERNEL AND RE-PARTITION----------------

We gonna repartition phone to reduce an unused preload partition of 512 Mo (stored Samsung updates that no more exist).

We gonna increase system partition to 1 GB so Android 7.1 and Gapps have enough space.

We gonna increase data partition so you can have all the apps you like.

ALL YOUR DATA WILL BE LOST.

FLASH RECOVERY FROM STOCK RECOVERY ----

Shut down phone.

Power it back on in recovery mode : Use Volume+ + Home + Power buttons and release them when you see Galaxy S2 logo.

### Alternative and easier process if your S2 can be recognized by PC using Heimdall : https://xdaforums.com/showpost.php?p=75002977&postcount=343

Then wait till the recovery launches.

### If you already have a custom recovery, go to the mark -!-!- below.

Using default recovery, use volume buttons to navigate and power to confirm,

install zip -> choose Philz_touch_6.48*.zip and install it.

When its done, shut down phone, restart in recovery mode. You are now in the Philz touch recovery.

### If it fails, you need to install CWM recovery using Odin software and SGS2 in Download mode.

### Use a good tutorial for Odin and SGS2 i9100 recovery flashing.

### Download CWM for Odin : https://www.androidfilehost.com/?fid=95916177934516900

### Once finished, continue operations below as if you had Philz recovery.

In Philz touch recovery (or your recovery -!-!-) : go to Wipe -> format /cache and format /system partitions.

Then back to install zip -> Flash kernel-lanchon*.zip (FLASH IT OR TWRP RECOVERY WON'T LAUNCH AND PHONE WILL BE BRICKED),

then flash recovery recovery-the.gangster-IsoRec-TWRP-3.1.0-0-i9100.zip.

Reboot phone to recovery again, it is now TWRP 3.1.0-0 Recovery !!!

Swipe to unlock filesystem.

Check never show this screen during boot again and swipe again.

In TWRP, go to Backup -> select Boot, System, Data,

Tap select Storage and select External storage,

then Swipe to Backup.

Backup is located on your microSD in the TWRP folder.

(To have latest TWRP recovery, go to Install > Select TWRP 3.1.1-0.img and swype to flash).

### Don't flash repit files if you don't have a TWRP recovery

### 2 MAIN CONFIGS TO REPARTITION :

- For standard config, just use the djibe-standard-repit*.zip included in my archive, you'll have :

1GB system, 6GB data (for apps), max internal storage (photos, temp files) and minimal preload (useless partition used for OTA offical updates).

- My PREFERED version is djibe-prefered-repit*.zip :

1GB system, 2GB Internal storage (limited size for photos and files because who takes photos with SGS2 ?), max data (about 11,5 GB for apps), minimal preload (useless partition).

### And a failproof repit one. If you get flash errors with repit files above, use this one.

- For more custom partitions, ask us in a post what partition sizes you want.

### Let the lanchon*.zip filename AS IS because the filename gives the instructions for the repit script. Lanchon is smart !

Go back to TWRP Home screen,

Plug phone to charger.

Tap go to Install, select lanchon-VERSIONYOUWANT-djibe-repit*.zip from your microSD (if file not seen, tap Select storage -> External-storage),

then Swipe to flash. There is an error, files have been copied to /tmp folder. It is normal !

Go back to Install -> Select Storage -> Internal Storage, OK.

Now tap on : (Up A Level),

scroll down and enter the "tmp" folder,

### If you use another PIT file to repartition (not mine -djibe-version), plug phone to Power source (not PC !) or you could hard brick your device.

tap on lanchon-VERSIONYOUWANT-djibe*.zip and Swipe to flash.

### never connect phone to PC during repit !!!

Let it process for 2 minutes.

4 ) Wipe partitions

INFO : F2FS is the fastest filesystem for read and write partitions on flash memories. Compared to EXT4, gain is from 15 to 280 %.

No need to format the /System partition because it is Read only and Ext4 is still faster.

Format has been done with repit. No need to manually format anymore.

Go to Wipe -> Advanced wipe,

select Dalvik, Cache, System, Data, Internal Storage then Swipe to Wipe, go back to TWRP Home.

5) INSTALL ROM, GAPPS AND ROOT

Still under TWRP Home screen -> go to Install zip and set Storage to External-Storage.

We need to install files 1 by 1.

Select lineage-14.1-*.zip and Swipe to flash,

Then select addonsu-*.zip (this is the Root) and Swipe to flash,

### You get this error : Updater process ended with signal: 4, Error installing zip file '/sdcard/Download/addonsu*.zip', don't care, root is correctly installed.

then open_gapps-arm-7.1*.zip, and Swipe to flash,

### If you are using ResurrectionRemix, don't flash any custom kernel at all !

Then wipe cache/dalvik,

then reboot system.

Wait for 15 minutes while Android starts for the first time.

6 ) ROOT ACCESS

Once in Android, open the Settings menu, select "About Phone".

Go to Settings -> About -> Hit 7 times on the build number, go back,

Go to the Developer options menu, root access -> activate ADB+apps

and Lower activate Local Terminal.

7) CALIBRATE BATTERY

In Google Play Store, download App Battery Calibration (from IMobS Ltd).

Launch the App.

Confirm root acces.

Plug tab and wait till charge hits 100%, then hit BATTERY CALIBRATION and unplug it.

8) You can use Backupyourmobile to restore data,

you can use GPS Status & Toolbox app to enhance GPS fix.

Enjoy,

djibe

THANKS --------------

Teams of : TWRP, Lineage OS, the.gangster, Lanchon, Resurrection remix, Philz, Skyline, MigoMujahid