In ATK, the flash size will only be shown after a successful operation involving the flash.
I've checked carefully and noticed the following:
- my device drops out of USB downloader mode very soon when there is no USB cable connection to my PC
- my device also drops out of USB downloader mode very soon when no communication is happening between the PC and the device. I guess that should be done by a properly installed USB driver, but I'm not sure about that yet.
BTW, the promised libusb(x/-1.0) based approach I wrote is ready for testing: https://www.mobileread.com/forums/sho...d.php?t=184310