hi everyone,
initially, successfully upgrade 3.1.2 to 4.0.1 then to 4.2.1 and unlocked.
after some time of installing ipa files and sync with itunes 10.1.x my iphone crashes forcing me to reboot.
unfortunately it started me in a cycle of "recovery mode" state.
----------------- for some time followed some guides to perform recovery for this issues ------------
TRIED THIS GUIDE BUT FAILED ME (1601) ERROR USING CUSTOM FW
Originally Posted by
mani_satcell 
1.open redsnow latest version
2.browse file 4.2.1 3gs orginal firmware
3.select only this option ( just enter pwned DFU mode right now)
4.then flash with this MEGAUPLOAD - The leading online storage and file delivery service custom firmware
5.after finish flash Do redsnow jailbreak procedure
( if new bootrom means stuck in apple logo after jailbreak pls dont try to flash again just do with redsnow JUST BOOT TETHERED RIGHT NOW option and wait for boot)
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AND STILL BACK ON RECOVERY MODE