Normal Electra escape steps:
 
1. Be sure to manually import the Electra installation package in Cydia Impactor

2. Enter your Apple ID and password and always confirm
 
Error BUG:
1.Provision cpp:81 You already have a current iOS Development certificate

 
Solutions:
(1) Download the old version of Cydia Impactor (0.9.43) to Revoke Certification (because the new version (0.9.44) to Revoke Certification),
Click Revoke Certification and enter the Apple ID and password that failed the last time, and finally you’ll be notified that it succeeded

Windows of the old version of Cydia Impactor (0.9.43) download address: https://cache.saurik.com/impactor/win/Impactor_0.9.43.zip
(2) Unplug and reconnect the iPhone/iPad data cable (note: this step should not be omitted; otherwise, the error will still be reported :81)
(3) Switch back to the latest CydiaImpactor (0.9.44) to jailbreak (that is, repeat the normal Electra jailbreak step above) and you will succeed this time