Alternative Firmware (Debian Jessie, Synology DSM6)

Hello, i had ubuntu on my my cloud mirror gen2 for a long time but now i want to return to give this NAS to technically not so advanced people. I tried it by pulling out the HDDs and by flashing the wd recovery in the dev/wd-recovery folder as well as writing the mtdblock4 bin. Now i have a telnet access but still no web address or so showing of to flash the original firmware. Wnat am i doing wrong?