For people who use Doze Editors :- https://forums.oneplus.net/threads/...s-oxygenos-3-0-1.439108/page-55#post-14861410

OXYGENOS 3.0.1 INSTALLATION INSTRUCTIONS ​

For 100% Stock Users :- Locked Bootloader,Stock Recovery,No Root (On OxygenOS 2.2.x or 3.0)



[If users don't want to loose apps :- Might lead to Play Services Crashes in the beginning and sometimes a bootloop too] ​

Download OxygenOS Zip from here :- http://oneplusroms.s3.amazonaws.com/OnePlus2Oxygen_14_OTA_018_all_1605231631_OpenBeta2.zip?AWSAccessKeyId=AKIAJ2SIWE7D3VMMGOEQ&Expires=1466682627&Signature=SDJhG6kwtksugok2GZQfnERUjDo=

Put Zip anywhere in Internal Storage.

Power Off Your Phone.

Reboot into recovery by pressing power+volume down button .

Select English.

Select Install from Local.

Select the Zip.

Click on Install

Wait for it to Install !!!!

Reboot.

Done.

[If users are ready to loose apps](Safer than above method) ​

Download OxygenOS Zip from here :- http://oneplusroms.s3.amazonaws.com/OnePlus2Oxygen_14_OTA_018_all_1605231631_OpenBeta2.zip?AWSAccessKeyId=AKIAJ2SIWE7D3VMMGOEQ&Expires=1466682627&Signature=SDJhG6kwtksugok2GZQfnERUjDo=

Put Zip anywhere in Internal Storage.

Power Off Your Phone.

Reboot into recovery by pressing power+volume down button .

Select English.

Select Wipe Data and Cache.Wipe Data and Cache.It might take some time.

Go to recovery home.

Select Install from Local.

Select the Zip.

Click on Install

Wait for it to Install !!!!

Reboot.

Done.

For Users Having TWRP (See end of post too,please)

[If you are on any ROM other than H2OS Marshmallow , OxygenOS 3.0 or ROMs based on them and want to Have a Clean Flash (Clean flash is the best way to prevent any bugs)] ​

Download OxygenOS Zip from here :- http://oneplusroms.s3.amazonaws.com/OnePlus2Oxygen_14_OTA_018_all_1605231631_OpenBeta2.zip?AWSAccessKeyId=AKIAJ2SIWE7D3VMMGOEQ&Expires=1466682627&Signature=SDJhG6kwtksugok2GZQfnERUjDo= and Modified TWRP recovery.img from here :- https://www.androidfilehost.com/?fid=24572330218882108 (Credits @Grarak)

Keep both these files anywhere in the Internal Storage.

Boot into TWRP.

Wipe -) Advcanced Wipe -) Select Dalvik,System,Data,Cache -) Swipe to wipe.

Go to TWRP Home.Select Install.Select OxygenOS Zip.Swipe to Install.

Go to TWRP home.Select Install.Select Images button at bottom right.Select recovery.img .Select Recovery.Swipe to flash.

Go to TWRP Home.Reboot -) Recovery.

Wait to reboot into recovery.

Wipe -) Advanced Wipe -) Select Dalvik,System,Data,Cache -) Swipe to wipe.

Go to TWRP Home.Install -) Select OxygenOS Zip.Swipe to flash.

[OPTIONAL] Flash this supersu to root :- https://www.androidfilehost.com/?fid=24459283995297946 (Credits @Yash98) It will bootloop one if you flash supersu and then will boot properly.Just wait.

Reboot into System.

Done !!

[If you are on H2OS Marshmallow, OxygenOS 3.0 or ROMs based on them and want to Have a Clean Flash ( Clean flash is the best way to prevent any bugs ) ] ​

Download OxygenOS Zip from here :- http://oneplusroms.s3.amazonaws.com/OnePlus2Oxygen_14_OTA_018_all_1605231631_OpenBeta2.zip?AWSAccessKeyId=AKIAJ2SIWE7D3VMMGOEQ&Expires=1466682627&Signature=SDJhG6kwtksugok2GZQfnERUjDo=

Keep it anywhere in the Internal Storage.

Boot into TWRP.

Wipe -) Advcanced Wipe -) Select Dalvik,System,Data,Cache -) Swipe to wipe.

Go to TWRP Home.Select Install.Select OxygenOS Zip.Swipe to Install.

[OPTIONAL] Flash this supersu to root :- https://www.androidfilehost.com/?fid=24459283995297946 (Credits @Yash98) It will bootloop one if you flash supersu and then will boot properly.Just wait.

Reboot into System.

Done !!

Most of the TWRP Users must be knowing it that by wiping /data they will be lossing all installed Apps.So,I recommend using Titanium Backup Pro to Backup all user apps and restore them after the clean flash.This way,your all apps will remain intact.Clean flash,undoubtedly,is the best way to flash. Click to expand...

[If you are on OxygenOS 2.2.x and for some reasons,don't want to Clean Flash (You might encounter Google Play Service Issues in the beginning or even a bootloop but as yoiu have unlocked bootloader,you have a better chance to be safe than stock users)]

​

Download OxygenOS Zip from here :- http://oneplusroms.s3.amazonaws.com/OnePlus2Oxygen_14_OTA_018_all_1605231631_OpenBeta2.zip?AWSAccessKeyId=AKIAJ2SIWE7D3VMMGOEQ&Expires=1466682627&Signature=SDJhG6kwtksugok2GZQfnERUjDo= and Modified TWRP recovery.img from here :- https://www.androidfilehost.com/?fid=24572330218882108 (Credits @Grarak)

Keep it anywhere in the Internal Storage.

Boot into TWRP.

Wipe -) Advcanced Wipe -) Select Dalvik,System,Cache -) Swipe to wipe.

Go to TWRP Home.Select Install.Select OxygenOS Zip.Swipe to Install.

Go to TWRP Home.Select Images button at bottom right.Select recovery.img . Select Recovery.Swipe to flash.

Go to TWRP Home.Select Reboot -) Recovery.Wait for it to reboot into recovery.

[OPTIONAL] Flash this supersu to root :- https://www.androidfilehost.com/?fid=24459283995297946 (Credits @Yash98) It will bootloop one if you flash supersu and then will boot properly.Just wait.

Reboot into System.

Done !!

Going to CM 13 and other Custom ROMs dated later than 04 June 2016 (If you have already unlocked bootloader and have modified TWRP mentioned above flashed) ​

Boot into recovery. ​ Wipe -) Advanced Wipe -) Select Dalvik,System,Data,Cache -) Swipe to Wipe. Go to TWRP Home. Clean flash ROM that uses old bootloader ,which you want to flash ,flash GApps,SuperSU or other whatever mods you want. Reboot into system !!!

If you haven't unlocked the bootloader or don't have the modified recovery mentioned here flashed yet,please follow the respective guides for the same.Thanks. Click to expand...



REVERTING TO ROMS REQUIRING OLD BOOTLOADER (OxygenOS 2.x or Unofficial CM 13 and other old custom ROMs dated earlier than 04 June 2016) ​

If you can't boot into recovery after flashing OxygenOS 3.0 (Credits :- @locxFIN

Download Stock recovery here: https://s3.amazonaws.com/oxygenos.oneplus.net/OP2_recovery.img Download and install 15sec ADB Installer as Administrator. Boot into Fastboot mode Connect your OP2 to your PC Open command prompt in the folder where the recovery file is Type "fastboot devices". If you get a line of numbers and letters, you're good to go. Type "fastboot flash recovery OP2_recovery.img" Type "fastboot boot OP2_recovery.img" or reboot to recovery the usual way (Power + Volume down) Flash OOS 3.0 once more