Install Android 5.1.1 Lollipop on Samsung Galaxy S2

[ I9100 I9100M I9100P I9100T ] Update & Install Android 5.1.1 Lollipop on Samsung Galaxy S2 CM 12.1

How to Install Android 5.1.1 CM 12.1 - 5.0.2 Lollipop on Galaxy S2 I9100

Supported Models Numbers of the Galaxy S2 Devices:
i9100,GT-I9100,GT-I9100M,GT-I9100P,GT-I9100T,SC-02C 

 
Learn How to Backup & Restore Your Entire Current Android System First Here - Optional For Safety:
https://www.youtube.com/watch?v=Q8M7cGf5ydc 

# Downloads 

Odin v3.07
http://adf.ly/1PVZOs

Samsung Mobile Phones USB Driver 1.5.6.0
http://adf.ly/1dFxKW or http://adf.ly/1dFxIZ

Donate via PayPal:
https://www.paypal.com/us/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FBWZUE4CQU62Y

CM-12-Kernel+Recovery-I9100.tar (Lollipop-Compatible for cm 12 & 12.1)
http://adf.ly/1PVYwN or http://adf.ly/1PVYle

ROM ZIP File - New CM 12.1 Android 5.1.1
http://adf.ly/1PQKrq

Gapps For CM 12.1
https://goo.gl/MpVi9Y  OR  http://tinyurl.com/njan9xq

Alternative Apps Used (Camera,FM Radio,Call Rec.,..etc)
don't install it via CWM or  anything, just extract this zip file normally & will see normal APK apps files, install them as needed
http://goo.gl/zfkhpo

TriangleAway-v3.26.apk
https://www.youtube.com/watch?v=RQkA15HdMOs

ROOT-UPDATE-SuperSU-v2.46.zip
http://goo.gl/E5qxZE




# Frequently Asked Questions 
Control USB Connection
[Method 1]
Go to Settings
Scroll down and tap on Storage
Press the Options key (or tap the ‘Options’ icon in the top right) and select “USB computer connection”
Check “Media device (MTP)”

[Method 2]
Form the "Alternative Apps" Link above, Use an App Called "USB Sharer"
or get it from (Play Store) http://goo.gl/D0Dn4Z

Missing Features & Notes
-WiFi Direct & Kies is Not Working in all Custom ROMs.
[ NEW ] Lock-Screen Widgets & Themes are Available in New Builds.

Root is Lost or Not Working ?
1-Download SuperSU.zip file, copy to internal memory
2-Reboot Into recovery mode and install superSU zip file
3-Reboot system and check the new root status using 'root checker' app for example.

No Network Signal or Cellular Network is not Working ?
-Try another newer or older build number than the one you're now running.
-Go to Settings > about phone  > update > check for updates.
-Toggle Air Plane Mode off and turn it on again, then it reads the sim card and gives you reception, if it doesn't work then update the ROM / change the build you use.
-You may also try Kitkat version with android 4.4.4 which is better than lollipop & more stable & don't has network issues, here:
https://www.youtube.com/watch?v=yNasUYszh4Q

Odin Doesn't Detect your Phone as in 02:37 ?
http://www.youtube.com/watch?v=6bXNlFr_A9k

Want to go back to Stock ROM with Android 4.1.2 ?
https://www.youtube.com/watch?v=XjSfipr95Fw

Fix S2 internal Sd By PIT File:
http://tinyurl.com/oababue
 
Gapps / Google Apps are Crashing ?
Three possible reasons
[1] You forgot to do a "factory reset" in the recovery before installing the entire ROM.
[2] You installed an incompatible Gapps Package with your android version , if your andorid version is 5.1 then use Gapps for android 5.1 also if your andorid verion is just 5.0 then use Gapps for android 5.0
[3] You tried to install multiple Gapps packages on the system (you have to format the entire '/system'
partition & re-install the ROM again to get the next gapps package work).
-If only one app is crashing then go to the settings,apps,find that app there,tap on it, click "clear data". then try to reopen that app.


# Related Videos
Update Galaxy S2 to Android 4.4.4 Kitkat
https://www.youtube.com/watch?v=yNasUYszh4Q

How to Change Galaxy S2 Boot-Screen Animation:
https://www.youtube.com/watch?v=NjsCvC3vB7g

Remove The Yellow Triangle & Reset Flash Counter Samsung Galaxy S2
https://www.youtube.com/watch?v=RQkA15HdMOs

Go back to stock Android 4.1.2 for Galaxy S2
https://www.youtube.com/watch?v=XjSfipr95Fw



Good Luck