try this "DS3615xs 6.1 Jun's Mod V1.02b (MBR_Genesys)" is good for dc5700
just configure your bios then usb to HDD
sorry im french so ...
i change :
on setup security lever
change all value setup password to none (all pages)
on os security
data execution prevention disable
os management of embedded security devise disable
and now i boot to my usb DS3615xs 6.1 Jun's Mod V1.02b (MBR_Genesys) just use hdd on boot menu