Also had the kernel panic issue, found the solution here.
Edit: For all the people not that familiar with this stuff:
- Boot a live USB Manjaro (download and “burn” that on any working computer)
- start terminal
- run
sudo -sto be root - run
manjaro-chroot -a - edit
/etc/mkinitcpio.confas shown in the link - run
mkinitcpio -P - exit chroot and reboot