I had dowloaded the .ISO format from here (managed by Polanskiman) , but can't boot in new VM.
Anyone know howto ,or where can i find the guide?
download this: https://www.dropbox.com/s/ytimsezu9cl61xx/synoboot_1.02b_ESXi_only.zip?dl=0
the only option available is ESXi, so you should not have problems regarding boot choice, it's for DS3615xs (i find has a better custom package support than DS3517xs).
- extract and upload synoboot.vmdk and synoboot.img in your datastore
- create a new VM (HW Version 11 or 13) dependent if you are on ESXi 6.0u2 or ESXi 6.5b
- operating system should be Other -> FreeBSD 64bit
- set