I had three charged off credit cards, Cap1, HSBC, and Applied Card.
Cap 1 I eventually settled and it now shows as a paid charge off. That was the best I could do with them.
I was able to get Applied Card to take the account back from the collection agency, accept 70% of the balance, and remove the tradeline from my credit reports.
HSBC was the best... I sent them a fairly substantial payment (I think it was around $200) and then made $50 monthly payments. After that first payment posted, they showed it as "Account closed by credit grantor" and "paying as agreed." After 14 monthly payments I was paid in full, and they re-opened the account.