If there is SD card in, likely that is what it booted from (well, uboot from emmc)
Check with lsblk, will show where / and /boot are,,,,, boot0 and boot1 are on emmc
If the etc/shadow (on emmc) is edited, there will be no password, just hit enter (twice)
example, not exact since I don't have manjaro booted (18NNN,, the N stands for number)
root::18NNN:::::: ---,,, this is as I remember, this is with NO password
What you will find when you start is
root:40-to-60-semi-random-chars:18NNN::::: --,, the semi random chars are your hashed password
no spaces
And do make a copy, just in case you screw up, when you have a copy, it ends up that you don't need it,,
and when you don't, often you go "shit, why didn't I make a copy"
Check with lsblk, will show where / and /boot are,,,,, boot0 and boot1 are on emmc
If the etc/shadow (on emmc) is edited, there will be no password, just hit enter (twice)
example, not exact since I don't have manjaro booted (18NNN,, the N stands for number)
root::18NNN:::::: ---,,, this is as I remember, this is with NO password
What you will find when you start is
root:40-to-60-semi-random-chars:18NNN::::: --,, the semi random chars are your hashed password
no spaces
And do make a copy, just in case you screw up, when you have a copy, it ends up that you don't need it,,
and when you don't, often you go "shit, why didn't I make a copy"