This method successfully worked for me & @lysm bre (Thanks to him for the guiding)!
Your phone will be unencrypted after folllowing this guide and successfully rooted too if I didn't mention that
To flash ROMs in future you have to disable encryption so this method will make you ready for that too
Here is my video in which I explained in detailed and I've done all the steps from beginning! So you can follow this guide too here- https://youtu.be/mUq1xdJ-7-E
To Boot into Bootloader mode use command adb reboot bootloader or hold power and volume down button once its switched off!
I'll modify & beutify the guide in future so stay tuned for that!
1] Unlock bootloader- fastboot oem unlock [select yes by pressing volume up and then power button to confirm]
2] Reboot & skip everything in setup as we data will be wiped again!
3] Reboot into bootloader & flash the modified boot image- fastboot flash boot boot.img
4] Reboot into system to make sure it's booting properly! [May not be necessary!]
5] Reboot into bootloader again & flash twrp- fastboot flash recovery "recovery name".img
6] Boot into TWRP & select allow modifications !
7] Goto Wipe & select format data !
8] After that is done, reboot into system without rooting& skip through setup again!
9] Now if you check the encryption status of your phone (Settings -> Security - Encrypt phone), it won't be encrypted anymore as it'll give you the option of encrypting it, which means it currently isn't encrypted.
10] Now transfer the SuperSU zip file in the internal storage of the phone, reboot into TWRP, and flash SuperSU!
BOOM! You have successfully rooted with encryption disabled.! Congratulations!
Just a reminder that for video explanation watch this- https://youtu.be/mUq1xdJ-7-E
Downloads-
Modified boot.img- http://bit.ly/1MVtrNr Thanks to @Chainfire ONLY FOR build no mdb08i as of now! Do not flash on any other build!
TWRP recovery image- https://dl.twrp.me/bullhead Thanks to @Dees_Troy
SuperSU zip- https://download.chainfire.eu/743/SuperSU Thanks to @Chainfire
Modified boot images for all nexus devices- http://bit.ly/modifiedbootimages Thanks to @Chainfire
Your phone will be unencrypted after folllowing this guide and successfully rooted too if I didn't mention that
To flash ROMs in future you have to disable encryption so this method will make you ready for that too
Here is my video in which I explained in detailed and I've done all the steps from beginning! So you can follow this guide too here- https://youtu.be/mUq1xdJ-7-E
To Boot into Bootloader mode use command adb reboot bootloader or hold power and volume down button once its switched off!
I'll modify & beutify the guide in future so stay tuned for that!
1] Unlock bootloader- fastboot oem unlock [select yes by pressing volume up and then power button to confirm]

2] Reboot & skip everything in setup as we data will be wiped again!
3] Reboot into bootloader & flash the modified boot image- fastboot flash boot boot.img
4] Reboot into system to make sure it's booting properly! [May not be necessary!]
5] Reboot into bootloader again & flash twrp- fastboot flash recovery "recovery name".img
6] Boot into TWRP & select allow modifications !
7] Goto Wipe & select format data !
8] After that is done, reboot into system without rooting& skip through setup again!
9] Now if you check the encryption status of your phone (Settings -> Security - Encrypt phone), it won't be encrypted anymore as it'll give you the option of encrypting it, which means it currently isn't encrypted.
10] Now transfer the SuperSU zip file in the internal storage of the phone, reboot into TWRP, and flash SuperSU!
BOOM! You have successfully rooted with encryption disabled.! Congratulations!
Just a reminder that for video explanation watch this- https://youtu.be/mUq1xdJ-7-E
Downloads-
Modified boot.img- http://bit.ly/1MVtrNr Thanks to @Chainfire ONLY FOR build no mdb08i as of now! Do not flash on any other build!
TWRP recovery image- https://dl.twrp.me/bullhead Thanks to @Dees_Troy
SuperSU zip- https://download.chainfire.eu/743/SuperSU Thanks to @Chainfire
Modified boot images for all nexus devices- http://bit.ly/modifiedbootimages Thanks to @Chainfire
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