If you are getting the heating issue on your device then visit the Service centre, and do the update from there..! It will help out to sort out the issue.
02:46 Heating Issue
To Resolve your problem of S20 FE heating, I have made a specific video , please watch that here is the link –
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# SamsungS20feheatingproblem
#SamsungGalaxyS20FEHeatingIssueResolved
But now in Future Samsung Phone will not Heat, and Samsung Phone will be the next King –https://youtu.be/qcSZuFTHgcc