Downgrade 4.1 to 3.x

is it possible to downgrade from 4.1 to 3.5 without losing settings and installed apps?

Upgrade from 3.5 to 4.1 went smooth (my phone is Samsung Galaxy 9). Everything works Ok on 4.1, but I experience some Bluetooth issues.
I can not connect to my Garmin watch any more. After some searching, I found out that reason for Bluetooth issues is upgraded Bluetooth stack on Android 13, and there is no fix available at the moment… so that’s why I want to return to 3.5.

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Yes indeed, some more information here: Bluetooth LE broken - #5 by vince31fr
You cannot go back to 3.5 without formatting data, and even more samsung anti-rollback security may prevent you to boot earlier android versions.
However, we can expect a fix for this issue.

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Thanks for clarifying.

Hey, I just upgraded to Iode 4.2 and can confirm that BLE is working now, Garmin watch connects.