Help in the transition from firmware from whited00r 7 to off. 4.2.1?

Question

iPhone

iPhone 3G 8Gb modem 06.15.00
Firmware: whited00r 7
Jailbreak: Yes
Jailbreak method: whited00r 7
Description of the problem:
Hello everyone.
They gave me a handsome 3G, 8 gig, it costs whited00r 7, everything is beautiful, clear, but I really want to put off 4.2.1
Yesterday I tried to do it, I flashed it through DFU, shift + restore, it constantly gives all sorts of errors like 1600, 1015, etc.
I introduced it into DFU both manually and through redsn0w, iRED.
Well, and accordingly throws on the cord + tuna.
I enter again in DFU and expose whited00r 7 unlocked and sew, everything is fine, there are no problems.
I even tried to sew through the rekoveri mod, it also gives errors.
Tell me what to do, how to solve this problem. The tuna version is the latest, the cable is original.

Answer 1

Did everything myself. I lowered the modem, flashed it on off 4.2.1, made a jailbreak, upgraded the modem, did an unlock and now everything is cool.

Answer 2

Perhaps the modem needs to be downgraded there? Look in the information about the device, if the "Modem version" is 6.15.00, then look for a way in Google, you will find it on any normal gadget forum, on the same w3bsit3-dns.com

Answer 3

Guys please help me to solve this problem.
He doesn’t want to install anything, nothing is done from this fucking whited00r 7 with a modem 06.15.00, I set off 3.1.3, set custom 3.1.3, set off 4.2.1, set custom 4.2.1, set custom made by me in sn0wbreeze, Nothing is set. I put all this through DFU, Recovery mode, PwnDFU, nothing comes out, or errors 1015, 1050, 1060, 1604, 1600, 1602, or just hangs in tuna on the "Preparing for firmware" section
Please help.