iOS4.3.1 Jailbreak for iphone / ipod all platform

Upgraded iphone 4 to ios 4.3.1 today, and jailbreak by little pineapple.
preparation: upgrade itune to v10.2.1,

1. download iOS 4.3.1 + redsn0w_win_0.9.6rc12, redsnow works across all platforms, iphone/ipod/ipad 大小通吃~ 
2. iTune: Shift + Restore, select firmware ios4.31, wait until sync completed. exit itune.
3. Jailbreak: run redsnow.exe, select fw 4.3.1, connect iphone to pc, then power off iphone
4. check "install Cydia" only,
5. DFU mode: power (3sec) => hold power + home (10sec) => hold home + release power (10+sec) till u see a change on redsnow, wait till finish.
6. let iphone auto reboot, setting => disable auto lock, this is to make sure cydia is not disturbed while download / install apps.
7. start cydia on iphone, it should do an initial system check, dont interupt till checking complete.
8. add http://www.sinfuliphonerepo.com/ source to cydia, then search & install  appsync, afc2add
9. done! now can use itune to sync back cracked ipa apps

JailBreak iphone 4/3GS to iOS 4.2.1

Update on 4/4, my iPhone 4 iOS 4.21 was jb by the same greenpoison file successfully.

Just safely upgraded & JB my 3gs to 4.2.1, which looks no diff from 4.1..

1. download iOS 4.2.1 fw + greenpois0n
2. iTune: shift + "Restore" --> select fw path --> upgrade ios
3. turn off iPhone, quit iTune, and then jb by greenpoison.exe (new ip4 takes very long time, as if device hang, just dont touch it
4. install Cydia: iphone click "Loader"
5. remove loader from iphone: loader --> option
6. disable screen auto lock, let Cydia do 1st time check, do not disturb until reboot done.
7. Cydia add source: http://cydia.hackulo.us
8. Cydia add source: http://www.sinfuliphonerepo.com
9. Search and install AppSync for ios 4.2.1
10. if afc2add was not installed by greenpoison automatically, install from modmyi, this enables installation of sj.91