iPhone could not be restored unknown error 1

"Hello!

I was tried more than 10 times to restore, in recovery mode and DFU mode but no success! Error 1

My phone was not under warranty and i have nothing to lose...

I opened it, cleaned the motherboard with isopropyl and heating with hairdryer for 5-6 minutes, especially over the baseband (near the sim card slot).

After that I tried to restore, and its working!!!

Sometimes it has problems with memory (out of memory alert) but after one month still working properly.

If your iphone 5s isn't under warranty, try this method, maybe will work....!!!"

"hi guy it is good news for those who having problem with their iPhone while restore or update and getting constantly errors like on windows (-1 ) and mac you will get error 3 and while device is connected to your computer the progressive bar will freeze at 60 to 75 percent and the respective message will pop up on windows and Mac. I am very much exhausted trying to get rid of this errors but no luck, even I have applied all method of apple websites as well as try from you tube help but no chance. I am a engineer myself of different trade but I very fond of these latest electronic gadgets.

Now let me tell you how I have over come this errors and got successful with this method I have applied with very much interest .

lets start the work .1 first make sure your device is on and apple logo or ITunes player connected appear on the device screen , take you device and put in plastic bag and please make sure no water enter inside the device through bag, it might damaged your hardware. Than place the device in the freezer for 45 to 60 minutes, Meantime keep your computer ready to connect your device with good USB cable. Removed the iPhone and connect immediately to the computer and massage begin to display extracting software it will progress slowly wait till end .Even you device might get disconnected while in progress don't worry ,let the progressive bar get end and message comes your device is not found .than you unplug it from computer and plug it again than procedure will continue till your phone is restore and new latest firmware is installed ,during the progress your phone will shows progressive bar on screen wait till further message you get successful Good luck

note : the real problem is that the firmware not extracting properly that is why phone can not be restore or update that is why hardware need to be frozen ,it need certain temperature ,because software is not responding to the hardware to get extract and install. It will not install room temperature or atmospheric ambient temperature.

S Diniz"

Any1 that ever had error 1 iv never heard of them fixing this as it's a hardware problem

"If your device can get into recovery mode than you should be able to boot into DFU mode.

Just to reiterate proper DFU instructions:

Plug Device into Computer and Open iTunes.Turn Device off completely.Hold Power and Home for 10 seconds (Display will turn off, hold for ~2 more seconds after this)Release Power and continue holding until the device registers in iTunes.

If the device registers in iTunes it is DFU and should be able to be fully restored.

I realize you state you could not get into DFU, I am just asking to try once more and report back.

Update

@Con

I have fixed it with a DFU restore before. I usually had that error when the IPSW wasn't being signed anymore by apple. I had to download the latest IPSW from a third party site, one that didn't have my SHSH blobs attached to the IPSW before it would work.

Although that was an error -1 if I remember correctly. Good call on the hardware failure. Look at the other topics posted, it sounds like water damage or possible hardware failure altogether.

Althought this seems to state: http://www.letskis.com/how-bypass-error-...

Which is my thought. If a proper DFU can be achieved than it should repair it."

"I'd say from reading all this that error 1 is a hardware problem caused by dry solder joints somewhere in the phone. Heating up the phone will basically improve the solder joints. This is risky though as you could also make other joints worse.

By putting the phone in the freezer and cooling it down you are decreasing the resistance of the poor joints, probably just by enough to get a good enough connection to finish the update.

Just a theory from applying a bit of logic. Now all we need is someone to identify exactly which solder joints are poor."

Ok guys, error -1 is an error where your baseband can't connect to the cpu. For those who don't know, there is a big brain (cpu) for the majority of the phone and a little brain (baseband cpu) just for the cell network. Typically the problem is caused by a cracked solder joint somewhere due to a drop or jolt. When you heat or cool anything on this earth, it changes in size ever so slightly. Heat expands the object and cooling shrinks it. So either way you go you are shifting the chip ever so slightly and the micro crack touches again and you get a working device. However once it returns to normal temp the crack will reappear. The most obvious spot to crack is under the baseband cpu or the big cpu. This is because the solder contacts are the smallest on the phone here and have very little yield strength to resist a jolt or drop. If Apple didn't use underfill (a water proofing black tar) on the chips you could just throw it in a reflow oven to fix, but they do. The only correct fix therefore is to remove and reball the baseband cpu! This is the hardest thing to do next to reballing the main cpu and only a handful of techs can accomplish it. If you do use the oven, you will prob lose network eventually and the next restore will be a repeat. If the baseband cpu went bad then you have to pull the trinity from a broken phone and put it on yours. If you don't know what that is, then you will never be able to do it anyways ;) If you are a tech and do decide to reball it, clean the tar around the contacts with a needle. The board contacts rip off easy because they are so small.