Re: Is there a way to transfer BTC from an offline wallet (Armory) to a new...
The only problem is that the private key that starts with 5 doesn't support yet on Electrum
You can import private keys that start with 5 into electrum and there is no need to make any conversion. Look at images below. I imported private keys exported from Armory wallet into electrum without any problem and generated same addresses.
Armory:
Electrum:
