I had the same issue, I wondered why this bios was stated on reddit as beta while it was not marked as beta on the website some days later it was stated as stable bios on reddit too, from u/ASUSTechMKTJJ. (
https://www.reddit.com/r/Amd/comments/hiqxds/new_uefi_2103_for_asus_c8h_crosshair_viii_hero_no/)
I installed the new bios via UEFI and set everything on default and started to type in my settings.
Suddenly the pc just reboot, while I´m in the bios....
So it won´t be any sudden windows issue.
Okay, I though maybe bad luck. Lets type in the settings.
Typed in all my stable settings from 1302 and started.
So far so good run a few cinebench test worked good. Played some RS6, everything fine. Chilling in the evening on twitch and discord.
Restart....
Next day I set everything on standard let run a karhu test over 10 hours while I was at the homeoffice.
No issues no restart.
After work turned of karhu, chillin on twitch...
restart.
turned on pc went to bios to check something...
restart in the bios again.
Flashed 1302 on USB2 did a bios flashback => Everything runs smooth no issues.
After the 2103 BIOS was announced on reddit as final bios I gave it another try. (
https://www.reddit.com/r/Amd/comments/hmiyrm/new_uefi_updates_for_asus_x570_b550_and_other_am4/)
This time with bios flashback to avoid any bad flashing issue.
moved to bios to confirm the optimised settings.
Restart...
Went back to 1302 everything is fine again.
This is the first time since 10 years ASUS Mainboards that I encountered such a messy bios
😞