If you're using 64-bit Linux server, you need to create a symbolic link from StandardERPServer64-Slave to StandardERPServer-Slave, otherwise it doesn't work. This is a bug I reported many years ago.
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...
