Despite combing the web for it, I was never able to find one.I don't think LG ever released a flasher tool for BP55EB40 SVC NB52.
Also, here's the BU40N CB05 firmware I posted in another thread (official LG Updater exe) :
https://mega.nz/file/W7QUTYrA#O1kfVyabL ... jC9ULfSWl4