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iphone 3gs ios 4.3.1 downgrade to 4.2.1 done proper DG procedure inside.
share ko lang proper way para sa 3gs downgrading ..
madami sa atin hirap sa ganitong problema error encounter like restore itunes error 3194,28,1015 etch pwedi nating iwasan ang mga error na yan follow crefully procedure lang.
NOTE: this procedure do your own risk but =RODBAUTIS= tested 100%.
mga tools na kailangan natin.
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NOTE AGAIN: kailangan edited ang host file nyo para smooth ang running ng tinyUmbrella natin.
proper format hostfile tinyUmbrella required
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iphone 3gs new bootrom before.
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simulan na natin una run tinyUmbrella check kung may naka save na shsh like this.
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ayun may naka save os 4.1 and 4.2.1, now before natin restore gamitan natin ng irebr4 para sa proper dfu mode,after run ireb open tinyUmbrella then hit start tss server..wag na wag nyo e coclose ang tiny w8t until restoring finish..
pwedi tayong gumamit ng CFW or OFW kayo na bahalang pumili i use original firmware kasi pag FU ang unit mejo sablay ang CFW walang signal.wag na ding magtaka sa sample unit ko FACTORY UNLOCK yan no need unlock na
now open itunes then select ofw or cfw firmware 4.2.1 hold shift and restore,
NOTE ULIT: mag kaka error kayo jan itunes error 1015 oooops wag mag panik walang tsunami joke lang para masaya.
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etong ganitong klaseng erro di kaya ng new tiny ireb etch... dito na papasok si Greenpoison after receive error 1015 direct jailbreak nyo using Greenpoison rc6.1 see picture here
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after run Greenpoison success back to normal na sya but dipa sya activated u can use redsnow para sa lock set for activation , baseband update jailbreak etch .,, dahil nga fu ang unit ko put any sim lang to activate.
after run GP normal set na sya.
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for unlocking procedure use search button nalang pagod na ako weeeee
fully working iphone 3gs 4.3.1 before downgrade to 4.2.1 done.
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LAST NOTE : this procedure good for unlockers not for price dumpers.
credits goes to RODBAUTIS!