It's an issue with the TSS server. It gives the following output:
Sending TSS request attempt 1... TSS server returned: <html>
<head><title>403 Forbidden</title></head>
<body bgcolor="white">
<center><h1>403 Forbidden</h1></center>
<hr><center>Shield</center>
</body>
</html>
Basically, it's on Apple's side. It's NOT an issue with your devices. Just wait a little while for them to fix it.
Finally, MacBook Pro OS X Yosemite Version 10.10.5 iTunes 12.6.1.27 successfully Updated the iPhone to ios 11 (I download and used shift + restore to update the download firmware) hope this will help all
Do you have a windows computer? I had the same issue on windows, then I restored my iPhone on a mac and it restored successfully.
I have been trying to restore on my wifes iphone all day. nothiong but issues... Till i signed out of iCloud..... its now restoring... and did the IOS11 update...
not saying it will work for you but maybe?
I had this problem too, but if you go to "Settings," then "General," then all the way at the bottom, you will see "Reset." Click on "Erase all Content and Settings" and that will have the same effect as restoring your phone. Note: you will need the password if there was a password on there.
Were you able to restore successfully after turning off firewalls?
I have the same problem and found a solution.
Try to use iTunes on a Mac to restore ur iPhone.
P.S. I change my iPhone into DFU Mode before resotring it.
Hoping I can help u guys.
yeah , u just have to turn find my iphone off before u restore ur iphone
from icloud ,, u can do that from the website of icloude or from ur iphone 🙂
thats it
Issue seem to be resolved, try restoring again.
log into icloud.com/find-with your apple ID and password
click on the device you are trying to update/restore
remove from account
log into iCloud.com/find
click on device you are trying to restore
remove from account
then restore/update in iTunes
Don't smash your brains out thinking. I just re-install my old Vaio with win 11. Install itunes 12.7 and tried again to update my iphone 7. Guess what!! Got the same error (3503) Also tried to install iOS 10.3.3 same thing. So this for sure apple's problem. I got my own cellphone workshop and do this all the time never saw this error before. Got to wait until tomorrow see what happends.
Thank you ZT21, I was stuck with the error 3503, after update to iOS 11, I do read your post and download this software: http://www.iphone-ipad-recovery.com/solve-iphone-stuck-in-recovery-mode.html, and the stuck was fix!!! I hope it help others fix the problem!!! I am so happy to solve mine!!!
So after successfully freeing my iPad Pro from the restore/update problem code of 3503 using the iMyfone windows software I have the IOS11 update seemingly fully operational. I did the update directly via my iPad though, and not via my Windows PC as before. I hope I haven't been too brave trying this...
Fortunately, I do have a full backup of my devices on my PC. Fingers crossed I don't need them. Now it's time to try this with my iPhone, again without using the PC. Wish me luck ;-)
I also used the IMYfone program that someone linked earlier and it worked with my ipad air 2.
3utools 2.16 can do it!
any idea what error 3503 is?
