When should I use "fastboot flashall"?

I have a custom i.MX8MQ board running Android 9.0. When I run "# adb reboot bootloader" from a adb shell The board reboots and stuck at U-Boot "Fastboot: Got ... Make sure when you connect in this mode that you do not take your finger off the Vol + button until the drivers are installed. What are your thoughts ... Oct 5, 2015 ... DNX Fastboot MODE.. 1hour shown bt till now not started... now i do what? This thread is locked. You can vote as helpful ... Dec 29, 2021 ... how to fix mobile stuck at fastboot mode | why does fastboot happen | how to fix fastboot issue | mi fastboot | redmi fastboot fix Link ... Apr 29, 2023 ... Mine is still stuck, every restart, every button starts fastbvoot menu. 2:55 · Go to channel · Xiaomi Redmi Stuck in Fastboot Mode? May 22, 2014 ... It's now stuck in "Enter into fastboot mode You can press POWER key for more than 10 seconds to reboot device" Oct 8, 2018 ... The tablet does not stay in modod fastboot, spend 10-20 seconds and it goes off again, when connecting to the computer everything is fine. Jun 2, 2015 ... All you have to do is hold down the volume down button and the power button and then plug in the USB cord real fast as it starting up and then we'll go ... Don't worry mann !!!! Press the power button for 10 to 15 secs.It will restart normally try it.My oneplus two also was in fastboot mode then when i tried to ... Dec 15, 2014 ... Member ... you can enter fastboot mode by turning your device completely off and turning it back on by holding down the Power and Volume Down ...