The host PC's USB controller is dropping out during the transfer speed shift. Swap your cable into a native USB 2.0 port on the back of the PC.
Before downloading random files, it is important to identify exactly what state your Lumia 650 is in.
Signature verification failed — the RKH in your HEX file doesn't match your phone
A complete emergency package for the Snapdragon 212 chipset inside the Lumia 650 requires two core components:
emergency files repack. Good sources include the community-maintained collection on Protobetatest. 2. Identify Your RM Version
When a Lumia 650 becomes hard-bricked, it often enters a Qualcomm Emergency Download (EDL) state, displaying a completely black screen while identifying in Windows Device Manager as QHSUSB_BULK or Qualcomm HS-USB QDLoader 9008 . Because Microsoft decommissioned the backend servers for Lumia devices, automating this recovery through standard software is no longer possible.