Hi @anon47238184,
Selecting “Remove x509” should do what you are asking for. I did that last July, just after Core Update 147 and upgraded my Diffie-Hellman parameter to 4096 and everything went without a hitch for me.
I would not expect to see what you are experiencing.
My only suggestion in that situation would be to remove the x509 root and host certificates, make a backup and then install 153 from fresh.
Then make the x509 root and host certificates again before restoring the backup to ensure it works as it should with a pristine install of 153.
Then, if that has worked OK, restore from your backup and see if everything is still OK.