Ah, I think I know what you mean. I installed a new Electron version and at the start the app asks me about my recovery phrase and I can click the options button and the BIP39-Seed box. But even if I enter my Blockchain-recovery phrase here, my bitcoin address is not imported. But know I cannot import a private key anymore, the option ist just missing in the electrum-menu.
Are you using Electrum 3.0? There is a option in the first step "Import Bitcoin addresses or private keys".
Try to follow this guide with your Blockchain private key:
Well, it seems like you're right. I checked my blockchain.info wallet which have some imported addresses and the private keys doesn't have checksum which is really odd.
You can convert it by using casascius' bitcoin address utility (
wiki,
download link), follow these steps:
1. Open 'Address > Enter an address/key' and enter blockchain.info's WIF key.
2. Copy the hex private key of the address that was added (view its details by right clicking it).
3. Open 'Tools > Base58 calculator' and enter the copied hex.
4. Go to 'Mode > Use Checksum' and make sure that it's checked and copy the base58 result.
5. Same as step 1 but enter the result from 4 instead.
6. Now your real address should be added. Just view the details and copy the WIF private key and import it to electrum.
Might want to wait few hours before doing this to let other users view this post. I'm pretty sure it's safe but just in case.