you can use iLO's virtual com port to monitor what happens, the local console is accessible through the com port
when using jun's loader without extra drivers you might want to try installing the original dsm 6.2(.0)-23739
the loader contains drivers and kernel from 6.2.0, wen installing you use 6.2.3 and there might be a driver incompatibility, never seen this but its possible
you could use the extra drivers for 6.2.3 and copy the kernel of 6.2.3 to the loader, rd.z and zImage from the 6.2.3 *.pat file (can be opened like a zip file), destination ist the 2nd partition, you just overwrite the files already there
https://xpenology.com/forum/topic/28321-driver-extension-jun-103b104b-for-dsm623-for-918-3615xs-3617xs/