Now my iphone is completely unlocked, with my account signed in and everything is legit, yet if I restore earlier ISPW, then iTunes keep giving me error that I cant install old firmware! I need to know if there are any free tools online or Github project that can flash old firmware into iPhone? or anyway to check what is causing kernel panic. I found the solution in iFixit where Barry's answers stated that (in short) this is Apples way of giving trouble by removing signed firmware! However he suggested a solution that utilizes paid version of the software to flash earlier version of firmware (ISPW) into iphone, using Reiboot After finding signed firmware I tried using iTunes but kept getting error 9.

After upgrading to iOS 14.4.2 my iphone keeps rebooting every 5 mins! I would like to restore my iphone to iOS 14.3.7. It is ReiBoot - iOS system recovery software, which can repair your device without leading to any data loss. Tenorshare ReiBoot es la herramienta de recuperación del sistema procesional de iOS que ayuda a reparar el sistema del iPhone en 10 minutos para solucionar casi todos los problemas de iOS.

Firmware reiboot