How to update the firmware of ROG Phone? Which firmware version should I choose?

[dcdobson2]

Hi.. I've recently bought this device and it's still on the original years old firmware.
I'd like to know what steps specifically I need to do in order to get it on latest stable /good battery version please.
I know I can't just upgrade to latest firmware, I have to do it in stages yes, 1 update after another?
What firmware?
Where from?
How?
What software on Pc do I use?

I have :
2018 model
Android 8.1.0
Baseband
M3 15 35 15 1-jedi_000621
Kernel
4.9.65.
Build number
Opm1. 171019. 026. ww_phone. 15 1616. 1808.23-0
Rom extension 1.1.12
European model.. 👍

Not rooted
Thanks in advance.

[Christine_ASUS]

Hi dcdobson2
Thank you for your asking. To update the system, you may try Auto Update or Manual Update.
1. Auto Update (Easier Way)
Settings>System>System update
*Tap the 3 dots on the top row of "System update">Auto-update settings, for related settings
2. Manual Update (Normally use in cross-Android firmware update or rooted/unlocked device)
Download the firmware file into the root directory, aka the outermost place, of the internal storage>Reboot>Tap the "system update" notification
*To perform cross-Android firmware update, please backup the device data first.
#[Zenfone] How to update firmware on my phone?
https://www.asus.com/support/FAQ/1009748/
#ROG Phone Firmware Spot
https://rog.asus.com/phones/rog-phone-model/helpdesk_bios/ 

However, which firmware version should I choose?
Each firmware version will optimize the system stability from the previous firmware version. Since right now you are in Android 8 (Oreo), you can try to upgrade to the latest Android 8 firmware version WW-15.1630.1907.98 (2019/09/03). You can also try to upgrade to Android 9 by manual update, if you still prefer Android 8 interface/system design, you can downgrade from Android 9 to Android 8 by Version Android P to O (WW SKU) (2019/12/04) file on Firmware Spot.

[Marco]

DON'T UPDATE! I updated to Android 9 and ASUS's Android 9 is full of bugs, a massive memory leak and poor memory management!

[hermantan89]

What I regret the most is the weather animation on the lock screen is gone.

[dcdobson2]

Well I've updated and now the phone is really slow at opening apps and navigating the ui.

It literally takes about 3/4 seconds to open an app.. That's unacceptable.