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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 Download 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)Source URL: https://k12-information.blogspot.com/2011/10/3gs-1015-error-fix.html
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