Thanks for he advice
Could you tell me step by step on your method so I can show him.
I’m a novice at this stuff.
Thanks
If all goes well I’ll tip
1. Open and run Bitcoin-qt.
2. Click on 'transaction' tab.
3. Find the corresponding transaction.
4. Right-click on that transaction and choose "Abandon Transaction".
However if the "Abandon Transaction" is greyed out(not clickable).
1. Close Bitcoin-qt.
2. Find the Bitcoin datadir.
3. Most probably C:\Users\YourUserName\Appdata\Roaming\Bitcoin\
4. Delete mempool.dat
5. Now start Bitcoin-qt with -walletbroadcast=0 as an option(argument).
6. Example on how to add an argument
http://cryptomining-blog.com/tag/zapwallettxes/7. Now he should be able to right-click that transaction and choose ""Abandon Transaction".
8. Close Bitcoin-qt and start Bitcoin-qt normally without any argument.
However if both options above fail.
1. Close Bitcoin-qt
2. Start Bitcoin-qt with -zapwallettxes as an argument
3. That argument will clear all unconfirmed transactions from his wallet.
4. Close Bitcoin-qt and start Bitcoin-qt normally without any argument.
Once the transaction is either Abandoned or cleared from the wallet, he can create a new transaction to you again.