After doing rpi-update on kernel 4.19.115-v7+ on ubuntu-mate 16.04.2 the raspberry pi 3 are unable to reboot and boot up at all. My HDMI display give No Signal. It have been having rebooting problems since the rpi-update kernel 4.19.115+. Ubuntu-mate 16.04.2 are brick or broken and not working.
I check my raspberry pi 3, there is no problem running with another SD Card on Raspbian.
Now I cannot boot up my ubuntu-mate 16.04.2 at all. All my files and bootmarks are stuck in there and there is no way to backup.
When I inserted the ubuntu-mate 16.04.2 on an external SD Card reader dongle, i can only see PI_ROOT and PI_BOOT.
I really do not know how to recover my ubuntu-mate 16.04.2 to make it boot.
I even try using another SD Card with fresh install ubuntu-mate 16.04.2 and do a rpi-update to the latest kernel 4.19.115-v7+. After upgrading, it cannot reboot and HDMI gives no Signal. So both my older SD Card and the Newer SD Card cannot boot at all.
Can anyone help me?