Thank you.

I check on blockchair.com/bitcoin-cash/blocks , to find the Tx ID, so now, I have these info :

On 1st August I moved my BTC to a new Armory wallet 2, about this transaction, Armory tells me the Lock-Time is Block 478557 and that the Tx is included in Block 478558. I exported the private key (one, for this wallet). The Tx is listed in BTC chain explorer AND in BCH chain explorer.

Later on 1st August, I moved my BTC from wallet 2 to a new Armory wallet 3, about this transaction, Armory tells me the Lock-Time is Block 478589 and that the Tx is included in Block 478591. I exported the private keys (two, for this wallet). The Tx is listed in BTC chain explorer but NOT in BCH chain explorer.
 
If I understand well, BCH blockchain after fork did not see my BTC moving from wallet 2 into wallet 3, and still believe my BTC are in this wallet ?

So, I suppose I must use the private key of wallet 2 to discover my BCH in a BCH wallet, right ?

So, if I understand well, I must import the private key from wallet 2 into Electron ?
I did it, but no BCC in balance.

I also tried to Sweep the privates key in Electron, still nothing.

Electron is configured to NOT Select server automatically, Proxy tab is set to Use SSL and NONE, and Server tab set to use server electroncash.cascharia.com at port 50002, it says :
Connected to 10 nodes
Blockchain : 478588 blocks
Chain split detected at block 478559
Your server is on branch 651ef99cb9 (30 blocks)

Help ! :-)

To import a private key, you only need to paste "5J...........................cA", nothing else, right ?

Thank you very much