Help! UI 2.0

[Podiace]

Is there a way to downgrade my S9+ (SM-G965F/DS) to UI 2.0? My phone got laggy after I update UI 2.1. Thank you.

[Cassidy]

If your phone get laggy, make a wipe cache partition like it's explain here :

Hey Keagan Halston or Kinsley, can you give me the right way to make a wipe cache partition on S9+, it's missing in my article..

[Podiace]

Already done this one. Still laggy after update.

[Cassidy]

How many space and memory rest on the phone...sorry for my english 

https://r1.community.samsung.com/t5/Others/How-to-optimize-your-Samsung-s-device/m-p/5545671#M24532

[Kinsley]

Hi Cassidy,

The steps you have shared for wipe cache partition is correct.

For your reference check the below steps for wiping the cache partition of Samsung Galaxy S9+:

- First, Turn off the device.

- Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.

- When the Android logo displays, release all three keys.

- An 'Installing system update' message will show for 30 - 60 seconds before the Android system recovery menu options appear.

- Press the Volume down key several times to highlight wipe cache partition.

- Press the Power key to select.

- Press the Volume down key to highlight yes, them and press the Power key to select.

- When the wipe cache partition is complete, Reboot system now is highlighted.

- Press the Power key to restart the device.

[CHMultimedia]

Same steps as any phone with a Bixby key. There are only 3 variants of the procedure: Home Button (S7 and older), Bixby Key (S8-S10), Power Only (S20 - , Tablets).

[Kinsley]

Hi Podiace, As you have performed the wipe cache partition and still facing the issue.  Follow the link provided by Cassidy, to optimize your device and let us know if those steps fix the issue.

If the issue still persists then backup your data using a smart switch and perform Factory Data Reset.

[RobertZ]

Eight out of ten proposed solution are "wipe the cache partition". If this is indeed a valid solution, you would think that Samsung would do this automatically instead having the customer incur so many issues.

[CHMultimedia]

Unfortunately, the Exynos OneUI 2.1 update incremented the bootloader version. It was v9 before, and it's now vA. What does that mean? It means that you can't downgrade sadly.