Try This File Not My Tested MDM Remover File :-
Here
This File Only U1
1:Download
odin and firmware.
2:Download
SM-A305Y MDM Remove File.
3: Open your phone on download mode.
4:Connect your phone on pc.
5:Open odin tool.
6:Select download firmware on AP Tab.
7:Click start buttion after complite.remoev data cable and trun on phone.
8:Now after open phone go to setting and reset your phone.
9:Now your samsung A30 SM-A305Y MDM Lock remove.