Dual SIM not working after update to Android 15

[SJHook]

Im reposting this from ROG forum, coz problem is still not solved for me 😞 Phone is  only 6 month old, everything was working smoothly till Android 15 came, then this happened : 

Hello, I recently updated my Asus ROG 8 phone to Android 15 (baseband version M2.11.27.34-SM8650_000220, build number AQ3.240812.002.35.1210.1420.78-0 release) and now my SIM cards are not working properly. It seems that slot 2 is causing the issue, as any card inserted there blocks both slots, if I put any card in slot 1 only, everything works normal. I have tried different SIM cards and restarted the phone, but the problem persists. Has anyone else experienced this issue or know how to fix it? Any assistance would be greatly appreciated.

[roguedroid]

I don't use Sim cards no more. Just Wi-Fi in ROG and Sim in HONOR.

Maybe you should take it to the ASUS real assistance.

[SJHook · Accepted solution]

Update: 

Changing SIM cards to brand new one, didnt help.

The issue has been resolved by performing a full wipe and factory reset. Now, the task remains to restore 79 applications and their associated credentials. I extend my gratitude to Asus for this experience 😞

[marksbras]

Thank you very much for your post.  I just start seeing that the Android 15 update is available for my rog 8 and was nervous about doing the update since when I had a rog phone 3 an Android update bricked the phone.  Given your comment I think I am going to hold off for a while.

[TMe6]

Sorry you’re dealing with this—post-update SIM issues are super frustrating, especially on a phone as new as the ROG 8! A few steps to try:

:keycap_1: Carrier Settings Update: Go to Settings > Network & Internet > Carrier Settings and check for updates. Sometimes carriers push fixes post-Android updates.
:keycap_2: Safe Mode Test: Boot into Safe Mode (hold power button > tap Restart in Safe Mode) to rule out third-party app conflicts.
:keycap_3: Reset Network Settings: Settings > System > Reset > Reset Network Settings (note: this clears saved Wi-Fi/BT connections).
:keycap_4: Factory Reset: If all else fails, backup and reset. Painful, but Android 15 might’ve borked something only a clean install can fix.