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A:
1. Make a backup of /boot/cmdline.txt
sudo cp /boot/cmdline.txt /boot/cmdline.txt.bak
2. Edit cmdline.txt file
sudo nano /boot/cmdline.txt
#Find this word in the line '''root=PARTUUID=xxxxxxxx-xx''', then replace 'root=PARTUUID=xxxxxxxx-xx' with ''''root=/dev/mmcblk0p22''''
#(those x'es are placeholders, actually they are letters and numbers)
# Make sure that file is a single line like it was before.