Sansung Glaxy M51 software update breaks numerous items

[mrg9999]

Samsung Galaxy M51

A firmware update (December 2021 Patch) arrived a few days ago and I updated.
Now numerous items are broken

Calendar  problem
After the Timezone was set to Vietname GMT+7

Ringtones
The sounds setting tries to open a non existent folder. If I change folder it won't let me select a ring tone.

How can I fix this without a total phone reset?

[INTRASERVER]

Hello. If you tell more what problem do you have it will help more to take a look how to fix. For the moment problem is with Calendar or Time Zone?
About ringtones this is sound like more you used some 3rd party app which changed location for ringtones or that ringtone doesn't exist any more.

[mrg9999]

The firmware update has added a vietnam timezone that I can't remove.
Hello
with respect your reply is of no help.
EVERYTHING WAS WORKING PERFECTLY DAY BEFORE FIRMWARE UPDATE.



I have no 3rd party ringtones app. Everything was working perfectly the day before the update.
The sounds is pointing at /storage/ringtones and there are the same mp3 ring tones as before but I can't select any

screenshots

Time zone problems
Time zone