Do you have the latest firmware installed on the RouterBOARD?
/system routerboard print is to check, current firmware to upgradable.
There were just different names and after upgrade all of them are back to default?
What about rules, where interface name is involved, they are invalid or also changed settings to the default interface names?
the latest firemware is 3.20 the routerboard is RB493
after upgrading from 3.20 to 4.4 all Ethernet interfaces changed to default and because of that i can’t access the router throw it’s ip address
cuz the ip address is assigned to interface named for example public and after upgrade the interface name changed to ether1 so the ip will not be assigned to the interface and the interface name filed in ip address will show as unknown .