bkerler responded to this issue a while ago.
Onyx Leaf 2 - QCS2290 (QCS_AGATTI) - USBError(19, 'No such device (it may have been disconnected))
How do I check supported CPU's in a folder of loaders again? I usually document everything for myself, but must have forgot that time. So, it might be supported by a 0x14D0E1 (sm6115) loader. I should download all loaders and find out which ones support sm6115?