Hello i have been using acer nitro v15 (nitro anv15-51) (i5 13420h, 16gb ,4050) from last 10 months its running all fine but suddenly after bios version 1. 16 update total usable ram memory droped from … I'm using a nitro np515-51 and trying to use a kobo ereader device with my computer. However, the device isn't being detected by windows.