[Xiaomi Redmi 1S] I Dragon:
Everyone was Searching for Dual Boot for Redmi 1S. Here it is. I (Nishantha Indika) have made Dual Boot System By getting help of 'xuelongqy' Dual Boot Scripts to Partition the Internal SD Card and The System Change App. So now you can use CM 12 as Second rom. Because that rom have Ril Bug and cannot usage daily.

You can swich the roms when you need fast and easy. No need to flash again and again. :D

I am not responsible for bricked devices, dead SD cards.

Note - Your data will be lost (Erased/Format) in Internal SD card and External SD card. So get a copy of data that you want...

What you Need :-

Dual Boot System Partition.zip = http://d-h.st/JsDc

CM 12 Dual Boot.zip = http://d-h.st/kLJ4

SD Card with minimum Class 6 (Class 10 Recomended) and Minimum 4GB SD Card

Windows PC

TWRP Recovery installed on your phone

Mini Partition tool Installed on your phone

Brain

Make sure your phone have over 70% Battery. Because It's safe for you...

How to Partition your Internal SD And Install First Rom

Copy any Custom ROM to your External SD Card that you want install as First ROM.

Copy "Dual Boot System Partition.zip" to Your External SD card

Boot into TWRP Recovery and Flash "Dual Boot System Partition.zip"

Then phone will automatically reboots into the Recovery again.

Now Flash Custom Rom as you want.

Reboot the System. Now you are in First Rom.

How to Partition your External SD Card Correctly

Remove the SD card from your Phone Connect your SD card using a Chip reader or Any SD card Reader

Follow this Video to get partition your SD Card Correctly.

Make Sure your Partitions on SD card are wanna be as

Partition 1 = fat32 = Normal Usage Partition (External SD)

Partition 2 = ext4 = Data Partition (Minimum 1GB Recommend)

Partition 3 = ext4 = Cache Partition (Minimum 300MB Recommend)

https://www.youtube.com/watch?v=KyOHcUB0X08&feature=youtu.be

[YOUTUBE]https://www.youtube.com/watch?v=KyOHcUB0X08&feature=youtu.be[/YOUTUBE]

After Finish Insert Your SD Card to Phone.

Install Storage Partition App (http://d-h.st/L9vB) open it and Touch and Drag from left side. You will see "Advanced" Click on it.

Scroll Down And Check is there have New Created Partitions as

mmcblk0p30

mmcblk1p2

mmcblk1p3

If not You Didn't done the partition steps correctly.

If YES You are ready to Go to Next Step.

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How to Activate Dual Boot and Install CM 12 as Second Rom

Copy these files

Copy "CM 12 Dual Boot.zip" to your SD Card

Flash "CM 12 Dual Boot.zip" using TWRP Recovery Mode

Reboot to System

You can see System Changer App installed on your apps. Click on it and Allow/Grant the Super User Access.

Phone will Automatically Reboots but will not Boot. Don't worry. Now you can see MI logo.

Press and Hold Power Button + Volume Up for 7 or 8 Seconds. Phone will automatically reboots into the Recovery and It shows as Second Rom.

Now go to wipe. Then go to Advanced Wipe and select

data

system

cache

dalvik cache

Then Wipe.

Now go to Restore. You will see CM 12 Dual Boot. Click on then Restore it.

After Complete Reboot to the system. Phone Will take little while first boot.

Now you can see CM 12 booted successfully. Now there have a app called System Changer App. Click on it and Allow/Grant the Super User access. Phone will Automatically Boots into the First Rom.

All Done... Congraz... Enjoy... :fingers-crossed:

You Can Switch the Systems (Change The Systems) by Just clicking on the System Changer App.

If your Second Rom not get boot or crashed just flash Custom Rom that u use as First ROM using TWRP Recovery Mode.

I will Upload new Roms As Dual Boot when they comes. Like MIUI 6, FIUI, RISE OS and More in Future.

Go tho This link to make any Custom Rom as Second Rom or Restore your Old Backup as Second Rom

http://xdaforums.com/redmi-1s/development/dual-boot-how-to-modify-rom-resotre-t3037373

How to Uninstall (Remove) Dual Boot System

Uninstall Dual Boot System = http://d-h.st/wHTT

Copy "Uninstall Dual Boot System.zip to your External SD card and Flash it using TWRP.

Now flash Any Custom rom you like and Reboot.

To remove the External SD partitions

Remove the SD Card and Insert it using Chip reader or any SD Card Reader. Then Using Mini Partition Tool

Select SD Card

Click on Delete

Then Click on Create

Select Primary and fat32

Press OK

Then Press on Apply

Give me your Valuable Feedback... Thank You for Reading... :highfive:

Credits

Nishantha Indika

xuelongqy

Sudeep Duhoon