I was lucky enough to find the package that Pigr in the forum posted actually would work fine out of the box with ESXi 6.7.
I'd write up in more details tonight to give a step by step on the installation method.
1.新增一個檔案 synoboot.vmdk貼上下面內容
2.下載103b引導 檔synoboot.img
3.用DiskGenius掛載 修改grub.cfg檔案內容
4.上傳至ESXI目錄
5.設定引導硬碟控制器SATA
6.新增硬碟 設定控制器 SCSI
7.設定BIos傳統模式