Dear Butters, did as you wrote.
It does not happen with the folder name 2512. With the name 1651 it is being flashed, but it does not go into mass storage mode. After reboot it is defined as O750.
Text from updater log:
Spoiler: LOG
Oregon 600 Software Version 5.60, UID: 4294967295, HWID: 4294967295
------------------------------------------------------------------------------
Parsing "ergn,41"
Success
Parsing "reboot"
Success