ab350 k4 system wont turn off after bios update

ok

well if its still not stable after (which may be the case with this new agesa)
i suggest the best option is as follows

use the DOS based flasher to revert to bios v3.00 (it seems dos is the only way to be sure to remove the later bios files properly) then instant flash to v3.20

hang on

did you update to bios 3.40 before updating to 4.30 ?

this is clearly written in red on the bios download page

it would seem the board requires a 'bridge bios' before trying to install this new agesa bios

it seems theres a lot of issues over the last few days with the new agesa bios releases

i suggest
enter bios load setup defaults save and exit
enter bios again and just save and exit
boot to windows run windows update 3 times

and see if anything has settled down

if after that you still have the issue
run the windows repair mode off your usb/installation media