You have to delete all files in Bulwark derictory on your PC except masternode.conf and wallet.dat
Then to start bulwark-qt of version bulwark-1.2.3.0 and everything should begin to work
I mined on bsod.pw all days except 19.03 while pool was upgrading and every coin has come to my wallet
Backing up your wallet first to avoid losing all your coins in your current wallet. Save it somewhere for later use.