Mein german ist nicht so gut, aber is wirkt bei mir.
Sie mussen der andere BootLoader gebrauchen.
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Finnaly got it working with the DS3615xs Version.
Yeah you are right here, I've used the V1.02a version of the Bootloader "DS3615xs 6.1 Jun's Mod V1.02-alpha" ( https://mega.nz/#F!BtFQ2DgC!JgomNP3X8V9EuwxL4TXbng!Fwki3A4B ), this in combination with the original .Pat file ( https://global.download.synology.com/download/DSM/release/6.1.1/15101/DSM_DS3615xs_15101.pat )
After you change the entries like "vid, pid, serial, etc." it will work just fine.
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Blue-Label1989