Based on the information provided the repairability of the Samsung Galaxy M21 seems to be fairly average. The lack of adhesive used for the back cover and the easy accessibility of the battery and battery cable are positive factors. However the use of strong adhesive for the battery and the need for alcohol to dissolve it are negative factors. The ability to remove the screen and screen cable without removing too many components is another positive aspect but the need to remove plastic covers to access cables is a negative factor. Overall I would give the repairability of the Samsung Galaxy M21 a score of 7.5 out of 10.