My system Acer Revo was running DS3615xs 6.1.2-15132 using Juns loader.
I installed DS361XS 7.1-42661 Using Auto Redpill V9.
I downloaded DSM 7,1-42661 update from synology site, then try manual Install.
* get to migrate system, then this error always comes up (Failed to install DSM, Failed to install File, The file is probably corrupted)