Most "system repair" functions are just automated versions of an iTunes Restore. You can manually put your phone into Recovery Mode or DFU Mode and use iTunes to "Restore" the firmware for free.
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: Many "free" codes are simply invalid or used to harvest your email for spam. Failed Repairs Most "system repair" functions are just automated versions
If you are trying to fix a stuck iPhone and the free version doesn't cover your specific issue, you might consider free alternatives like (using DFU mode) or certified open-source tools . Tenorshare ReiBoot license