Firmware list:
https://4pda.ru/forum/index.php?showtopic=164173 Recovery mode:
- turn off iPhone
- push and hold Home button
- connect iPhone to PC using USB cable
- start iTunes
- recover iPhone: wait until iTunes donload firmware and install it
https://4pda.ru/forum/index.php?showtopic=636263 Flash old or other firmware then currently instlled on iPhone:
- enter DFU mode:
-turn off iPhone
- push and hold Home button
- push and hold Power button
- hold both buttons for 10 sec
- release Power button and keep holding Home button for 15 sec
- connect iPhone to PC using USB cable
- start iTunes
- hold shift button on PC's keyboard and click on Recover button in iTunes
- browse and select donloaded firmware file
https://4pda.ru/forum/index.php?showtopic=132446https://4pda.ru/forum/index.php?showtopic=154216 Полезный сайт по софту и железу iPhone
http://www.mobile-files.com/