How do I upgrade from an rooted and unencrypted OOS 5.0.4 to OOS 9.0.5?

[allard1997]

So recently I've been thinking of upgrading my phone from Oreo to Pie now that it is available and has had a few updates.
Now I haven't updated my phone in a while. The last time was around the summer of 2018. The OxygenOS version my 3T currently is running is 5.0.4 and my TWRP is on version 3.2.3-0.
A while back I was using the custom ROM 'FreedomOS' (for anyone that still remembers) but that ROM hit it's EOL point last year.
After FreedomOS went EOL I switched to stock ROM following this guide to stay decrypted: https://forum.xda-developers.com/oneplus-3t/how-to/disable-dm-verity-force-encryption-op3t-t3688748
Since I switched back to stock I haven't touched the system or recovery at all besides updating Magisk now and then.

Now the question I'm having is how do I update my phone to the latest Pie version of OxygenOS? Which is version 9.0.5 as of writing this post.
Preferably I would like to upgrade with a dirty flash to keep my data (if I run into issues after I'll clean flash) and I also want to stay dencrypted and have Magisk as root.

 

[wojtek007pl]

For your own sakes don't do that. You probably won't be happy unless you want to update to have bigger numer in info screen. (Well if you would like to update to have bigger number in info screen I would suggest editing some conf file to achieve that.)

 

[BrahmaGandhi]

it's here all the the time, just follow the guide

https://forum.xda-developers.com/oneplus-3t/how-to/official-oxygenos-5-0-1-android-8-0-t3728119

 

[allard1997]

First of all, both of you thanks for the replies.

For your own sakes don't do that. You probably won't be happy unless you want to update to have bigger numer in info screen. (Well if you would like to update to have bigger number in info screen I would suggest editing some conf file to achieve that.)

Is the update that bad? If so, what makes Pie so much worse when comparing it to Oreo?

it's here all the the time, just follow the guide

https://forum.xda-developers.com/oneplus-3t/how-to/official-oxygenos-5-0-1-android-8-0-t3728119

I've read through the thread a bit and notices this: "Important Note: If your device’s Bootloader is Unlocked, then installing this firmware will factory reset your phone as this is a firmware upgrade. All your personal data and app data will be wiped clean! So backup before flashing!"
Does this mean it will actually reset the entire phone and will wipe all of my apps and files? Is there not a way to dirty flash this new version without losing my apps and such?

Now also in the "Custom ROM" part it says the following: "3. Format Data partition - system will be encrypted (this is a must else system will not boot the new Android version)"
As my device is unencrypted at the moment do I need to let it encrypt for OOS 9 to actually boot up? Or can I just follow the steps in this guide and follow procedure 1 to stay unencrypted? https://forum.xda-developers.com/oneplus-3t/how-to/dm-verity-disable-oxygen-os-t3922324

 

[wojtek007pl]

First of all, both of you thanks for the replies.



Is the update that bad? If so, what makes Pie so much worse when comparing it to Oreo?

In simple words phone is slower and hotter. Battery isn't better too (battery life for me was decreased from 5 to 3, 3.5 hours screen on time). You can find more on Oneplus forums.

 

[BrahmaGandhi]

First of all, both of you thanks for the replies.



Is the update that bad? If so, what makes Pie so much worse when comparing it to Oreo?




I've read through the thread a bit and notices this: "Important Note: If your device’s Bootloader is Unlocked, then installing this firmware will factory reset your phone as this is a firmware upgrade. All your personal data and app data will be wiped clean! So backup before flashing!"
Does this mean it will actually reset the entire phone and will wipe all of my apps and files? Is there not a way to dirty flash this new version without losing my apps and such?

Now also in the "Custom ROM" part it says the following: "3. Format Data partition - system will be encrypted (this is a must else system will not boot the new Android version)"
As my device is unencrypted at the moment do I need to let it encrypt for OOS 9 to actually boot up? Or can I just follow the steps in this guide and follow procedure 1 to stay unencrypted? https://forum.xda-developers.com/oneplus-3t/how-to/dm-verity-disable-oxygen-os-t3922324

i personally would suggest you to stay on oreo or jump to pie custom roms, just skip the oos 9.0.5..
the only thing that really fast and smooth just the face unlock feature :laugh:

as far as i know when you flashed stock oos your data will always be (re)encrypted, unless you do the firmware's patch things like you did before.
jumping (upgrade) from diff. android version it's better to do a clean flash (4 wipes, exclude int. storage will be saved)...and it's mandatory required (from stock to any custom roms). except when you forced to format data you'll lost all data in your phone, for sure.
and if you want to stay unencrypted and disable dm verity for good, it's better to do all that stuffs while on stock oos before you jump onto custom roms.

for more details and assistance i suggest you post on the main thread.