MMS not working at all. (Straight Talk)

[jake124490]

Hi, I have an HTC One (AT&T) that I use with a straight talk SIM. I have a this problem where I can not send or receive MMS at all, it just says "generic network failure". I looked it up and some people said it works once you update to Sense 6, but because I am on Straight Talk, I haven't gotten the OTA update and I am not sure when I will. I have tried every APN setup I could find on the internet, none worked. I have data and SMS, just no MMS. Oh, it used to be rooted, but I undid that and relocked the bootloader, if that has anything to do with it. Anyone know a fix?