My friend did get a email from
contact@electrumsupport.co
This email address is scam, because the Electrum wallet website is
https://electrum.org/. Any official email from Electrum wallet software must has electrum.org
in email address.
They said That he has bitcoins at one "watch only wallet". He did lose some money to a scammer before, but they say he can get it back now.
It's scam too.
A watch-only wallet does not contain private key, and you only can access Bitcoin if you have access to its private key. Nobody can spend bitcoin with a watch-only wallet, and nobody can reverse Bitcoin blockchain to get stolen bitcoin back to victims of scammers.