How to upgrade 83SR04 to 83SR50 with *.GRE files

we have isue that 83SR04 was discontinue and replace with new product 83SR50. to upgrade this modul we need 3 files type (*.STR, *.ADR & *.GRE), backup using PDDS. in the procontrol P14 83SR50 is not identification GRE files, how to solve this isue?