The higher the score the higher the probability is that you will pay it back on time. I would not trust any loan officer that tried to lend me money if my credit score was that low. That would be an indication they need the sale a lot more than they care about your welfare. Have your realtor introduce you to the loan officer they trust the most and ask for guidance, then follow the directions provided by the LO.
We would have to find a seller willing to be the bank. There are other things involved like if the seller owns the property free and clear. Another way to purchase with a less than perfect credit score is to rent with the option to buy while you are working on improving your credit score. You might be surprised at how fast this can be done.
Nice Lady REal Estate