I forgot a password for iPhone 5C, error 4013 if try to restore I was not using my iPhone 5C for a long time and forgot a password for it. How to use it now? I left it for some time without a power and the only thing it forgot was time, so now it writes that next attempt to enter a password will be in 49 years from now.

If I try to update my phone, it says



If I try to restore the phone, the following error occurs:



Where are these error codes documented?
Apple documents iTunes restore error codes online:


https://support.apple.com/en-us/HT201444


So, your next step with that error would be to contact Apple Support.