is multiple dfu restore or respring is harmful to ios device??

[kevin kang]

i did multiple dfu or respring and crash(safety reboot)...etc,, because of jailbreak!!

is it harmful to ios device?? and jailbreak can make mainboard broke??

 

[T5BRICK]

i did multiple dfu or respring and crash(safety reboot)...etc,, because of jailbreak!!

is it harmful to ios device?? and jailbreak can make mainboard broke??

No it's not harmful and jail breaking can't break any hardware.