Thanks for your response. I sincerely appreciate your efforts. Please let me know which website or tool is the best for checking the checksum and correcting the public address. Thanks.
To fix that address I simply decoded it to hex, calculated the correct checksum, and then re-encoded it in Base58. You could probably use a site like
https://gobittest.appspot.com to do this online if you wanted.
I really don't know why you want to, though. None of this is in any way relevant whatsoever to your private key with the incorrect characters. Have you tried brute forcing it with btcrecover yet as I suggested above? Do you want me to try for you?
Thanks for your response.
I did know about the web site which you have mentioned but since its online, I am not comfortable checking out the checksum of the private key which I have in order to gather info of the corresponding pubkey address.
I wish to interact web site offline availability, hence I enquired from you. I am currently using FinderOuter offline but I have not come across checksum of pub address or private key, since the private key I have has been showing checksum errors on several occasions.
As I mentioned earlier on my posts, my key starts with 5 but is followed by F and has I included as one of the characters and l on one of the last seven characters (which I presume as checksum) of the key.Please correct me if I am wrong.
My current position is that I am unable to share this key with any recovery/investigation due to unknown public address key and their total number of bitcoins. I am in the process of getting other details of the transaction and then I may have other details which can be shared. Thanks again for your responses.