Unbrick from Qualcomm QDL/DIAG mode Home › Forums › Xiaomi Mi4c libra › General Discussion › Unbrick from Qualcomm QDL/DIAG mode Tagged: lsusb, mi4c, Qualcomm, Unbrick, usb This topic contains 1 reply, has 1 voice, and was last updated by flow2fly 8 months, 2 weeks ago. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts October 30, 2016 at 2:24 am #11337 flow2flyParticipant I somehow managed to get the phone into some kind of Qualcomm debug mode or so. Screen completely black, the only sign of life is to attach it to Linux and use “lsusb” The way to reset the phone is to long press for 2-3 minutes power and volume up or down. This happened to me some time ago, just wanted to let you guys know in case it happens to you. No need to send the phone back to the service center. August 8, 2017 at 1:15 am #13480 flow2flyParticipant The correct combination is Volume DOWN + Power. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.